| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/10/16 21:34 | flow | patch-triage |
3mArgs:null Results: {
"EnableConfigs": [
"HID",
"HID_HAPTIC",
"HID_MULTITOUCH",
"UHID"
],
"FocusSymbols": [
"hid_haptic_init",
"hid_haptic_destroy",
"hid_haptic_devm_release",
"hid_haptic_input_configured"
],
"KMSANReasoning": "The patch modifies driver lifecycle and cleanup handling in drivers/hid/hid-haptic.c by moving resource deallocation from hid_haptic_destroy() into a devres action (hid_haptic_devm_release()), adjusting module/device reference counting, and avoiding double-frees of the haptic device struct.\n\nThese changes deal strictly with resource lifetime, object referencing (get_device/put_device, input_get_device/input_put_device), workqueue draining, and preventing double-free/use-after-free conditions. Any potential regressions or bugs introduced here (e.g., use-after-free, double-free, dangling pointers, reference leaks) are standard memory lifecycle issues effectively caught by KASAN and refcount debugging.\n\nThe patch does not introduce or modify any reads of uninitialized stack, heap, or page memory, nor does it affect padding, bounds, or data exposed to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false,
"Reasoning": "The patch refactors the teardown and lifetime management of HID haptic devices by migrating resource cleanup from the input force-feedback destroy callback (hid_haptic_destroy) to a devres action (hid_haptic_devm_release), while pinning the input_dev and updating reference counting in hid_haptic_init. This code is reachable from user space via software-emulated HID interfaces (/dev/uhid and USB raw gadget / dummy_hcd) when matching multitouch haptic touchpad descriptors. Fuzzing is warranted to test object lifetimes, reference counting, and potential race conditions or regressions during device teardown.",
"WorthFuzzing": true
} |
| 1/1 | 2026/10/16 21:34 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 2e5400d46d5cfd4e802c6511c32bf5bf76f0a265\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Oct 16 21:34:22 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/hid/hid-haptic.c b/drivers/hid/hid-haptic.c\nindex 8760eeb08b2cd..109b4dfd1e65a 100644\n--- a/drivers/hid/hid-haptic.c\n+++ b/drivers/hid/hid-haptic.c\n@@ -379,32 +379,57 @@ static int hid_haptic_erase(struct input_dev *dev, int effect_id)\n \n static void hid_haptic_destroy(struct ff_device *ff)\n {\n-\tstruct hid_haptic_device *haptic = ff-\u003eprivate;\n-\tstruct hid_device *hdev = haptic-\u003ehdev;\n+\t/*\n+\t * Resource cleanup is handled by hid_haptic_devm_release() which\n+\t * runs at driver unbind. This callback only disconnects the FF\n+\t * subsystem's pointer so input_ff_destroy()'s kfree(ff-\u003eprivate)\n+\t * becomes kfree(NULL), preventing a double-free of the\n+\t * devres-managed haptic struct.\n+\t */\n+\tff-\u003eprivate = NULL;\n+}\n+\n+static void hid_haptic_devm_release(void *data)\n+{\n+\tstruct hid_haptic_device *haptic = data;\n+\tstruct input_dev *dev = haptic-\u003einput_dev;\n \tint r;\n \n-\tif (hdev)\n-\t\tput_device(\u0026hdev-\u003edev);\n+\t/*\n+\t * Drain pending work first -- handlers dereference ff-\u003eprivate\n+\t * through the input_dev, so the workqueue must be idle before\n+\t * we NULL that pointer or free any buffers.\n+\t */\n+\tif (haptic-\u003ewq) {\n+\t\tdestroy_workqueue(haptic-\u003ewq);\n+\t\thaptic-\u003ewq = NULL;\n+\t}\n+\n+\tif (dev \u0026\u0026 dev-\u003eff \u0026\u0026 dev-\u003eff-\u003eprivate == haptic)\n+\t\tdev-\u003eff-\u003eprivate = NULL;\n+\n+\tif (haptic-\u003ehdev)\n+\t\tput_device(\u0026haptic-\u003ehdev-\u003edev);\n \n \tkfree(haptic-\u003estop_effect.report_buf);\n \thaptic-\u003estop_effect.report_buf = NULL;\n \n \tif (haptic-\u003eeffect) {\n-\t\tfor (r = 0; r \u003c ff-\u003emax_effects; r++)\n+\t\tfor (r = 0; r \u003c FF_MAX_EFFECTS; r++)\n \t\t\tkfree(haptic-\u003eeffect[r].report_buf);\n \t\tkfree(haptic-\u003eeffect);\n \t}\n \thaptic-\u003eeffect = NULL;\n \n-\tdestroy_workqueue(haptic-\u003ewq);\n-\thaptic-\u003ewq = NULL;\n-\n \tkfree(haptic-\u003eduration_map);\n \thaptic-\u003eduration_map = NULL;\n \n \tkfree(haptic-\u003ehid_usage_map);\n \thaptic-\u003ehid_usage_map = NULL;\n \n+\tif (dev)\n+\t\tinput_put_device(dev);\n+\n \tmodule_put(THIS_MODULE);\n }\n \n@@ -420,7 +445,8 @@ int hid_haptic_init(struct hid_device *hdev,\n \tconst char *prefix = \"hid-haptic\";\n \tchar *name;\n \tint (*flush)(struct input_dev *dev, struct file *file);\n-\tint (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);\n+\tint (*event)(struct input_dev *dev, unsigned int type,\n+\t\t unsigned int code, int value);\n \n \thaptic-\u003ehdev = hdev;\n \thaptic-\u003emax_waveform_id = max(2u, haptic-\u003emax_waveform_id);\n@@ -501,11 +527,25 @@ int hid_haptic_init(struct hid_device *hdev,\n \n \tinput_set_capability(dev, EV_FF, FF_HAPTIC);\n \n+\tif (!try_module_get(THIS_MODULE)) {\n+\t\tdev_err(\u0026hdev-\u003edev, \"Failed to increase module count.\\n\");\n+\t\tret = -ENODEV;\n+\t\tgoto stop_buffer_free;\n+\t}\n+\tif (!get_device(\u0026hdev-\u003edev)) {\n+\t\tdev_err(\u0026hdev-\u003edev, \"Failed to get hdev device.\\n\");\n+\t\tret = -ENODEV;\n+\t\tmodule_put(THIS_MODULE);\n+\t\tgoto stop_buffer_free;\n+\t}\n+\n \tflush = dev-\u003eflush;\n \tevent = dev-\u003eevent;\n \tret = input_ff_create(dev, FF_MAX_EFFECTS);\n \tif (ret) {\n \t\tdev_err(\u0026hdev-\u003edev, \"Failed to create ff device.\\n\");\n+\t\tput_device(\u0026hdev-\u003edev);\n+\t\tmodule_put(THIS_MODULE);\n \t\tgoto stop_buffer_free;\n \t}\n \n@@ -515,23 +555,27 @@ int hid_haptic_init(struct hid_device *hdev,\n \tff-\u003eplayback = hid_haptic_playback;\n \tff-\u003eerase = hid_haptic_erase;\n \tff-\u003edestroy = hid_haptic_destroy;\n-\tif (!try_module_get(THIS_MODULE)) {\n-\t\tdev_err(\u0026hdev-\u003edev, \"Failed to increase module count.\\n\");\n-\t\tgoto input_free;\n-\t}\n-\tif (!get_device(\u0026hdev-\u003edev)) {\n-\t\tdev_err(\u0026hdev-\u003edev, \"Failed to get hdev device.\\n\");\n+\n+\t/*\n+\t * Pin the input device so it cannot be released concurrently\n+\t * with our devres cleanup. hid_haptic_devm_release() drops\n+\t * this reference after cleanup is complete.\n+\t */\n+\tinput_get_device(dev);\n+\n+\tret = devm_add_action(\u0026hdev-\u003edev, hid_haptic_devm_release, haptic);\n+\tif (ret) {\n+\t\tinput_ff_destroy(dev);\n+\t\tdev-\u003eflush = flush;\n+\t\tdev-\u003eevent = event;\n+\t\tinput_put_device(dev);\n+\t\tput_device(\u0026hdev-\u003edev);\n \t\tmodule_put(THIS_MODULE);\n-\t\tgoto input_free;\n+\t\tgoto stop_buffer_free;\n \t}\n+\n \treturn 0;\n \n-input_free:\n-\tinput_ff_destroy(dev);\n-\t/* Restore dev flush and event */\n-\tdev-\u003eflush = flush;\n-\tdev-\u003eevent = event;\n-\treturn ret;\n stop_buffer_free:\n \tkfree(haptic-\u003estop_effect.report_buf);\n \thaptic-\u003estop_effect.report_buf = NULL;\n"
} |
| 2/1 | 2026/10/16 21:34 | agent | patch-evaluator |
3mModel:core Args: null Results: {
"EnableConfigs": [
"HID",
"HID_HAPTIC",
"HID_MULTITOUCH",
"UHID"
],
"FocusSymbols": [
"hid_haptic_init",
"hid_haptic_destroy",
"hid_haptic_devm_release",
"hid_haptic_input_configured"
],
"Reasoning": "The patch refactors the teardown and lifetime management of HID haptic devices by migrating resource cleanup from the input force-feedback destroy callback (hid_haptic_destroy) to a devres action (hid_haptic_devm_release), while pinning the input_dev and updating reference counting in hid_haptic_init. This code is reachable from user space via software-emulated HID interfaces (/dev/uhid and USB raw gadget / dummy_hcd) when matching multitouch haptic touchpad descriptors. Fuzzing is warranted to test object lifetimes, reference counting, and potential race conditions or regressions during device teardown.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.
IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.
================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.
- REACHABILITY IS THE PRIMARY GATE:
Fuzzing can only discover bugs in code that can actually execute in standard virtualized
environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
regardless of whether it adds assertions or complex logic.
- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
Patch authors routinely label changes as "cleanups", "refactorings", or state
"No functional change intended". Do NOT take these claims at face value.
Code refactorings that rearrange logic, introduce helper functions, or alter state management
in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
If reachable executable code is modified or refactored, it MUST be fuzzed.
- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
Even if the author believes the invariant always holds, fuzzing is essential to verify whether
an unusual sequence of operations can violate it.
================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:
- Non-kernel and non-executable changes:
* Modifications to Documentation/, comments, or spelling fixes.
* User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
that do not affect the compiled kernel image (vmlinux) or kernel modules.
* Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
that do not alter control flow or data structures.
* Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
* Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
* Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
physical PCI hot-unplug or manual sysfs driver unbinding.
* Code paths exclusive to architectures other than the target architecture.
================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
* Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
* Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
* Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
* Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).
================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:
- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
Do NOT list generic, ubiquitous functions called by almost every program in the corpus
(including, but not limited to: general memory allocators and deallocators, page fault
and trap handlers, or core synchronization primitives; this is not an exhaustive list).
Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
which severely dilutes fuzzing effort away from the actual changes.
- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
List functions that specifically implement the logic being added or altered, or direct API entrypoints
for the subsystem feature under review.
- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).
================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit 2e5400d46d5cfd4e802c6511c32bf5bf76f0a265
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Oct 16 21:34:22 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/hid/hid-haptic.c b/drivers/hid/hid-haptic.c
index 8760eeb08b2cd..109b4dfd1e65a 100644
--- a/drivers/hid/hid-haptic.c
+++ b/drivers/hid/hid-haptic.c
@@ -379,32 +379,57 @@ static int hid_haptic_erase(struct input_dev *dev, int effect_id)
static void hid_haptic_destroy(struct ff_device *ff)
{
- struct hid_haptic_device *haptic = ff->private;
- struct hid_device *hdev = haptic->hdev;
+ /*
+ * Resource cleanup is handled by hid_haptic_devm_release() which
+ * runs at driver unbind. This callback only disconnects the FF
+ * subsystem's pointer so input_ff_destroy()'s kfree(ff->private)
+ * becomes kfree(NULL), preventing a double-free of the
+ * devres-managed haptic struct.
+ */
+ ff->private = NULL;
+}
+
+static void hid_haptic_devm_release(void *data)
+{
+ struct hid_haptic_device *haptic = data;
+ struct input_dev *dev = haptic->input_dev;
int r;
- if (hdev)
- put_device(&hdev->dev);
+ /*
+ * Drain pending work first -- handlers dereference ff->private
+ * through the input_dev, so the workqueue must be idle before
+ * we NULL that pointer or free any buffers.
+ */
+ if (haptic->wq) {
+ destroy_workqueue(haptic->wq);
+ haptic->wq = NULL;
+ }
+
+ if (dev && dev->ff && dev->ff->private == haptic)
+ dev->ff->private = NULL;
+
+ if (haptic->hdev)
+ put_device(&haptic->hdev->dev);
kfree(haptic->stop_effect.report_buf);
haptic->stop_effect.report_buf = NULL;
if (haptic->effect) {
- for (r = 0; r < ff->max_effects; r++)
+ for (r = 0; r < FF_MAX_EFFECTS; r++)
kfree(haptic->effect[r].report_buf);
kfree(haptic->effect);
}
haptic->effect = NULL;
- destroy_workqueue(haptic->wq);
- haptic->wq = NULL;
-
kfree(haptic->duration_map);
haptic->duration_map = NULL;
kfree(haptic->hid_usage_map);
haptic->hid_usage_map = NULL;
+ if (dev)
+ input_put_device(dev);
+
module_put(THIS_MODULE);
}
@@ -420,7 +445,8 @@ int hid_haptic_init(struct hid_device *hdev,
const char *prefix = "hid-haptic";
char *name;
int (*flush)(struct input_dev *dev, struct file *file);
- int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
+ int (*event)(struct input_dev *dev, unsigned int type,
+ unsigned int code, int value);
haptic->hdev = hdev;
haptic->max_waveform_id = max(2u, haptic->max_waveform_id);
@@ -501,11 +527,25 @@ int hid_haptic_init(struct hid_device *hdev,
input_set_capability(dev, EV_FF, FF_HAPTIC);
+ if (!try_module_get(THIS_MODULE)) {
+ dev_err(&hdev->dev, "Failed to increase module count.\n");
+ ret = -ENODEV;
+ goto stop_buffer_free;
+ }
+ if (!get_device(&hdev->dev)) {
+ dev_err(&hdev->dev, "Failed to get hdev device.\n");
+ ret = -ENODEV;
+ module_put(THIS_MODULE);
+ goto stop_buffer_free;
+ }
+
flush = dev->flush;
event = dev->event;
ret = input_ff_create(dev, FF_MAX_EFFECTS);
if (ret) {
dev_err(&hdev->dev, "Failed to create ff device.\n");
+ put_device(&hdev->dev);
+ module_put(THIS_MODULE);
goto stop_buffer_free;
}
@@ -515,23 +555,27 @@ int hid_haptic_init(struct hid_device *hdev,
ff->playback = hid_haptic_playback;
ff->erase = hid_haptic_erase;
ff->destroy = hid_haptic_destroy;
- if (!try_module_get(THIS_MODULE)) {
- dev_err(&hdev->dev, "Failed to increase module count.\n");
- goto input_free;
- }
- if (!get_device(&hdev->dev)) {
- dev_err(&hdev->dev, "Failed to get hdev device.\n");
+
+ /*
+ * Pin the input device so it cannot be released concurrently
+ * with our devres cleanup. hid_haptic_devm_release() drops
+ * this reference after cleanup is complete.
+ */
+ input_get_device(dev);
+
+ ret = devm_add_action(&hdev->dev, hid_haptic_devm_release, haptic);
+ if (ret) {
+ input_ff_destroy(dev);
+ dev->flush = flush;
+ dev->event = event;
+ input_put_device(dev);
+ put_device(&hdev->dev);
module_put(THIS_MODULE);
- goto input_free;
+ goto stop_buffer_free;
}
+
return 0;
-input_free:
- input_ff_destroy(dev);
- /* Restore dev flush and event */
- dev->flush = flush;
- dev->event = event;
- return ret;
stop_buffer_free:
kfree(haptic->stop_effect.report_buf);
haptic->stop_effect.report_buf = NULL;
|
| 3/2 | 2026/10/16 21:34 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 4502 output: 28 thoughts: 104 Thoughts: **Analyzing the HID Haptic Driver Patch** Okay, so this patch targets `drivers/hid/hid-haptic.c`. My first move is always to get a solid grasp of the existing codebase before diving into the changes. I'm going to leverage my usual workflow. I need to understand what `hid_haptic_init` does, where it's called, and what configurations are in play. I'll probably use `grepper` or `read-file` to zero in on `drivers/hid/hid-haptic.c`, specifically looking for calls to that init function. This will give me a quick overview of the driver's setup and dependencies. Then, I'll take a close read of `drivers/hid/hid-haptic.c` itself, and zero in on the exact lines that call `hid_haptic_init`. This initial investigation should give me the context I need to properly evaluate the patch. |
| 4/2 | 2026/10/16 21:34 | tool | grepper |
0mArgs:{
"Expression": "hid_haptic",
"PathPrefixes": [
"drivers/hid"
]
}Results: {
"Output": "\nFull output is too long, showing 200 out of 253 lines.\nUse more precise expression or PathPrefixes if possible.\n\nNumber of matching lines per file (3 files in total):\ndrivers/hid/hid-haptic.c:45\ndrivers/hid/hid-haptic.h:29\ndrivers/hid/hid-multitouch.c:7\n\ndrivers/hid/hid-haptic.c-12-\ndrivers/hid/hid-haptic.c:13:void hid_haptic_feature_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.c:14:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-15-\t\t\t\tstruct hid_field *field, struct hid_usage *usage)\n--\ndrivers/hid/hid-haptic.c-48-}\ndrivers/hid/hid-haptic.c:49:EXPORT_SYMBOL_GPL(hid_haptic_feature_mapping);\ndrivers/hid/hid-haptic.c-50-\ndrivers/hid/hid-haptic.c:51:bool hid_haptic_check_pressure_unit(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-52-\t\t\t\t struct hid_input *hi, struct hid_field *field)\n--\ndrivers/hid/hid-haptic.c-62-}\ndrivers/hid/hid-haptic.c:63:EXPORT_SYMBOL_GPL(hid_haptic_check_pressure_unit);\ndrivers/hid/hid-haptic.c-64-\ndrivers/hid/hid-haptic.c:65:int hid_haptic_input_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.c:66:\t\t\t struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-67-\t\t\t struct hid_input *hi,\n--\ndrivers/hid/hid-haptic.c-78-}\ndrivers/hid/hid-haptic.c:79:EXPORT_SYMBOL_GPL(hid_haptic_input_mapping);\ndrivers/hid/hid-haptic.c-80-\ndrivers/hid/hid-haptic.c:81:int hid_haptic_input_configured(struct hid_device *hdev,\ndrivers/hid/hid-haptic.c:82:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-83-\t\t\t\tstruct hid_input *hi)\n--\ndrivers/hid/hid-haptic.c-94-\ndrivers/hid/hid-haptic.c:95:\terror = hid_haptic_init(hdev, haptic, hi-\u003einput);\ndrivers/hid/hid-haptic.c-96-\tif (error) {\n--\ndrivers/hid/hid-haptic.c-103-}\ndrivers/hid/hid-haptic.c:104:EXPORT_SYMBOL_GPL(hid_haptic_input_configured);\ndrivers/hid/hid-haptic.c-105-\ndrivers/hid/hid-haptic.c:106:static void parse_auto_trigger_field(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-107-\t\t\t\t struct hid_field *field)\n--\ndrivers/hid/hid-haptic.c-154-\ndrivers/hid/hid-haptic.c:155:static void fill_effect_buf(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-156-\t\t\t struct ff_haptic_effect *effect,\ndrivers/hid/hid-haptic.c:157:\t\t\t struct hid_haptic_effect *haptic_effect,\ndrivers/hid/hid-haptic.c-158-\t\t\t int waveform_ordinal)\n--\ndrivers/hid/hid-haptic.c-208-\ndrivers/hid/hid-haptic.c:209:static void switch_mode(struct hid_device *hdev, struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-210-\t\t\tint mode)\n--\ndrivers/hid/hid-haptic.c-240-\ndrivers/hid/hid-haptic.c:241:static int hid_haptic_upload_effect(struct input_dev *dev, struct ff_effect *effect,\ndrivers/hid/hid-haptic.c-242-\t\t\t\t struct ff_effect *old)\n--\ndrivers/hid/hid-haptic.c-245-\tstruct ff_device *ff = dev-\u003eff;\ndrivers/hid/hid-haptic.c:246:\tstruct hid_haptic_device *haptic = ff-\u003eprivate;\ndrivers/hid/hid-haptic.c-247-\tint i, ordinal = 0;\n--\ndrivers/hid/hid-haptic.c-283-\ndrivers/hid/hid-haptic.c:284:static int play_effect(struct hid_device *hdev, struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c:285:\t\t struct hid_haptic_effect *effect)\ndrivers/hid/hid-haptic.c-286-{\n--\ndrivers/hid/hid-haptic.c=302=static void haptic_work_handler(struct work_struct *work)\n--\ndrivers/hid/hid-haptic.c-304-\ndrivers/hid/hid-haptic.c:305:\tstruct hid_haptic_effect *effect = container_of(work,\ndrivers/hid/hid-haptic.c:306:\t\t\t\t\t\t\tstruct hid_haptic_effect,\ndrivers/hid/hid-haptic.c-307-\t\t\t\t\t\t\twork);\n--\ndrivers/hid/hid-haptic.c-309-\tstruct hid_device *hdev = input_get_drvdata(dev);\ndrivers/hid/hid-haptic.c:310:\tstruct hid_haptic_device *haptic = dev-\u003eff-\u003eprivate;\ndrivers/hid/hid-haptic.c-311-\n--\ndrivers/hid/hid-haptic.c-320-\ndrivers/hid/hid-haptic.c:321:static int hid_haptic_playback(struct input_dev *dev, int effect_id, int value)\ndrivers/hid/hid-haptic.c-322-{\ndrivers/hid/hid-haptic.c:323:\tstruct hid_haptic_device *haptic = dev-\u003eff-\u003eprivate;\ndrivers/hid/hid-haptic.c-324-\n--\ndrivers/hid/hid-haptic.c=333=static void effect_set_default(struct ff_effect *effect)\n--\ndrivers/hid/hid-haptic.c-342-\ndrivers/hid/hid-haptic.c:343:static int hid_haptic_erase(struct input_dev *dev, int effect_id)\ndrivers/hid/hid-haptic.c-344-{\ndrivers/hid/hid-haptic.c:345:\tstruct hid_haptic_device *haptic = dev-\u003eff-\u003eprivate;\ndrivers/hid/hid-haptic.c-346-\tstruct hid_device *hdev = input_get_drvdata(dev);\n--\ndrivers/hid/hid-haptic.c-379-\ndrivers/hid/hid-haptic.c:380:static void hid_haptic_destroy(struct ff_device *ff)\ndrivers/hid/hid-haptic.c-381-{\ndrivers/hid/hid-haptic.c-382-\t/*\ndrivers/hid/hid-haptic.c:383:\t * Resource cleanup is handled by hid_haptic_devm_release() which\ndrivers/hid/hid-haptic.c-384-\t * runs at driver unbind. This callback only disconnects the FF\n--\ndrivers/hid/hid-haptic.c-391-\ndrivers/hid/hid-haptic.c:392:static void hid_haptic_devm_release(void *data)\ndrivers/hid/hid-haptic.c-393-{\ndrivers/hid/hid-haptic.c:394:\tstruct hid_haptic_device *haptic = data;\ndrivers/hid/hid-haptic.c-395-\tstruct input_dev *dev = haptic-\u003einput_dev;\n--\ndrivers/hid/hid-haptic.c-435-\ndrivers/hid/hid-haptic.c:436:int hid_haptic_init(struct hid_device *hdev,\ndrivers/hid/hid-haptic.c:437:\t\t struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-438-\t\t struct input_dev *dev)\n--\ndrivers/hid/hid-haptic.c-495-\t}\ndrivers/hid/hid-haptic.c:496:\thaptic-\u003eeffect = kzalloc_objs(struct hid_haptic_effect, FF_MAX_EFFECTS);\ndrivers/hid/hid-haptic.c-497-\tif (!haptic-\u003eeffect) {\n--\ndrivers/hid/hid-haptic.c-553-\tff-\u003eprivate = haptic;\ndrivers/hid/hid-haptic.c:554:\tff-\u003eupload = hid_haptic_upload_effect;\ndrivers/hid/hid-haptic.c:555:\tff-\u003eplayback = hid_haptic_playback;\ndrivers/hid/hid-haptic.c:556:\tff-\u003eerase = hid_haptic_erase;\ndrivers/hid/hid-haptic.c:557:\tff-\u003edestroy = hid_haptic_destroy;\ndrivers/hid/hid-haptic.c-558-\n--\ndrivers/hid/hid-haptic.c-560-\t * Pin the input device so it cannot be released concurrently\ndrivers/hid/hid-haptic.c:561:\t * with our devres cleanup. hid_haptic_devm_release() drops\ndrivers/hid/hid-haptic.c-562-\t * this reference after cleanup is complete.\n--\ndrivers/hid/hid-haptic.c-565-\ndrivers/hid/hid-haptic.c:566:\tret = devm_add_action(\u0026hdev-\u003edev, hid_haptic_devm_release, haptic);\ndrivers/hid/hid-haptic.c-567-\tif (ret) {\n--\ndrivers/hid/hid-haptic.c-598-}\ndrivers/hid/hid-haptic.c:599:EXPORT_SYMBOL_GPL(hid_haptic_init);\ndrivers/hid/hid-haptic.c-600-\ndrivers/hid/hid-haptic.c:601:void hid_haptic_pressure_reset(struct hid_haptic_device *haptic)\ndrivers/hid/hid-haptic.c-602-{\n--\ndrivers/hid/hid-haptic.c-604-}\ndrivers/hid/hid-haptic.c:605:EXPORT_SYMBOL_GPL(hid_haptic_pressure_reset);\ndrivers/hid/hid-haptic.c-606-\ndrivers/hid/hid-haptic.c:607:void hid_haptic_pressure_increase(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-608-\t\t\t\t __s32 pressure)\n--\ndrivers/hid/hid-haptic.c-611-}\ndrivers/hid/hid-haptic.c:612:EXPORT_SYMBOL_GPL(hid_haptic_pressure_increase);\n--\ndrivers/hid/hid-haptic.h-15-\ndrivers/hid/hid-haptic.h:16:struct hid_haptic_effect {\ndrivers/hid/hid-haptic.h-17-\tu8 *report_buf;\n--\ndrivers/hid/hid-haptic.h-23-\ndrivers/hid/hid-haptic.h:24:struct hid_haptic_effect_node {\ndrivers/hid/hid-haptic.h-25-\tstruct list_head node;\n--\ndrivers/hid/hid-haptic.h-28-\ndrivers/hid/hid-haptic.h:29:struct hid_haptic_device {\ndrivers/hid/hid-haptic.h-30-\tstruct input_dev *input_dev;\n--\ndrivers/hid/hid-haptic.h-52-\tu16 release_ordinal;\ndrivers/hid/hid-haptic.h:53:\tstruct hid_haptic_effect *effect;\ndrivers/hid/hid-haptic.h:54:\tstruct hid_haptic_effect stop_effect;\ndrivers/hid/hid-haptic.h-55-};\n--\ndrivers/hid/hid-haptic.h-57-#if IS_ENABLED(CONFIG_HID_HAPTIC)\ndrivers/hid/hid-haptic.h:58:void hid_haptic_feature_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:59:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-60-\t\t\t\tstruct hid_field *field, struct hid_usage\ndrivers/hid/hid-haptic.h-61-\t\t\t\t*usage);\ndrivers/hid/hid-haptic.h:62:bool hid_haptic_check_pressure_unit(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-63-\t\t\t\t struct hid_input *hi, struct hid_field *field);\ndrivers/hid/hid-haptic.h:64:int hid_haptic_input_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:65:\t\t\t struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-66-\t\t\t struct hid_input *hi,\n--\ndrivers/hid/hid-haptic.h-68-\t\t\t unsigned long **bit, int *max);\ndrivers/hid/hid-haptic.h:69:int hid_haptic_input_configured(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:70:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-71-\t\t\t\tstruct hid_input *hi);\ndrivers/hid/hid-haptic.h:72:int hid_haptic_init(struct hid_device *hdev, struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-73-\t\t struct input_dev *dev);\ndrivers/hid/hid-haptic.h:74:void hid_haptic_handle_press_release(struct hid_haptic_device *haptic);\ndrivers/hid/hid-haptic.h:75:void hid_haptic_pressure_reset(struct hid_haptic_device *haptic);\ndrivers/hid/hid-haptic.h:76:void hid_haptic_pressure_increase(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-77-\t\t\t\t __s32 pressure);\n--\ndrivers/hid/hid-haptic.h=79=static inline\ndrivers/hid/hid-haptic.h:80:void hid_haptic_feature_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:81:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-82-\t\t\t\tstruct hid_field *field, struct hid_usage\n--\ndrivers/hid/hid-haptic.h=85=static inline\ndrivers/hid/hid-haptic.h:86:bool hid_haptic_check_pressure_unit(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-87-\t\t\t\t struct hid_input *hi, struct hid_field *field)\n--\ndrivers/hid/hid-haptic.h=91=static inline\ndrivers/hid/hid-haptic.h:92:int hid_haptic_input_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:93:\t\t\t struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-94-\t\t\t struct hid_input *hi,\n--\ndrivers/hid/hid-haptic.h=100=static inline\ndrivers/hid/hid-haptic.h:101:int hid_haptic_input_configured(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:102:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-103-\t\t\t\tstruct hid_input *hi)\n--\ndrivers/hid/hid-haptic.h=107=static inline\ndrivers/hid/hid-haptic.h:108:void hid_haptic_reset(struct hid_device *hdev, struct hid_haptic_device *haptic)\ndrivers/hid/hid-haptic.h-109-{}\ndrivers/hid/hid-haptic.h=110=static inline\ndrivers/hid/hid-haptic.h:111:int hid_haptic_init(struct hid_device *hdev, struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-112-\t\t struct input_dev *dev)\n--\n\n"
} |
| 5/2 | 2026/10/16 21:34 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 9217 output: 36 thoughts: 40 Thoughts: Okay, let's dive into this code. **Investigating the Usage of `hid-haptic.c`** Alright, my first instinct is to understand how `hid-haptic.c` is actually being utilized within the broader HID driver framework. I need to get a handle on what other modules or drivers are calling into it, what functionality they're leveraging. So, the direct approach is to see where it's being mentioned in the source tree. Specifically, let's explore instances of "hid_haptic". A quick grep or code search is in order here. A quick scan of drivers/hid/hid-multitouch.c is the next logical step. I'll need to check the lines within this file that reference "hid_haptic". Multi-touch devices frequently have haptic feedback, so this is a prime candidate for interaction. I need to understand what aspects of haptic interaction are implemented within this driver or if it just integrates haptics support. I suspect it's integration. |
| 6/2 | 2026/10/16 21:34 | tool | grepper |
0mArgs:{
"Expression": "hid_haptic",
"PathPrefixes": [
"drivers/hid/hid-multitouch.c"
]
}Results: {
"Output": "drivers/hid/hid-multitouch.c=173=struct mt_device {\n--\ndrivers/hid/hid-multitouch.c-175-\tstruct timer_list release_timer;\t/* to release sticky fingers */\ndrivers/hid/hid-multitouch.c:176:\tstruct hid_haptic_device *haptic;\t/* haptic related configuration */\ndrivers/hid/hid-multitouch.c-177-\tstruct hid_device *hdev;\t/* hid_device we're attached to */\n--\ndrivers/hid/hid-multitouch.c=566=static void mt_feature_mapping(struct hid_device *hdev,\n--\ndrivers/hid/hid-multitouch.c-607-\ndrivers/hid/hid-multitouch.c:608:\thid_haptic_feature_mapping(hdev, td-\u003ehaptic, field, usage);\ndrivers/hid/hid-multitouch.c-609-}\n--\ndrivers/hid/hid-multitouch.c=815=static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,\n--\ndrivers/hid/hid-multitouch.c-965-\t\t\ttd-\u003eis_haptic_touchpad =\ndrivers/hid/hid-multitouch.c:966:\t\t\t\thid_haptic_check_pressure_unit(td-\u003ehaptic,\ndrivers/hid/hid-multitouch.c-967-\t\t\t\t\t\t\t hi, field);\n--\ndrivers/hid/hid-multitouch.c=1075=static void mt_sync_frame(struct mt_device *td, struct mt_application *app,\n--\ndrivers/hid/hid-multitouch.c-1089-\tif (td-\u003eis_haptic_touchpad)\ndrivers/hid/hid-multitouch.c:1090:\t\thid_haptic_pressure_reset(td-\u003ehaptic);\ndrivers/hid/hid-multitouch.c-1091-}\n--\ndrivers/hid/hid-multitouch.c=1123=static int mt_process_slot(struct mt_device *td, struct input_dev *input,\n--\ndrivers/hid/hid-multitouch.c-1242-\t\tif (td-\u003eis_haptic_touchpad)\ndrivers/hid/hid-multitouch.c:1243:\t\t\thid_haptic_pressure_increase(td-\u003ehaptic, *slot-\u003ep);\ndrivers/hid/hid-multitouch.c-1244-\n--\ndrivers/hid/hid-multitouch.c=1487=static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,\n--\ndrivers/hid/hid-multitouch.c-1556-\ndrivers/hid/hid-multitouch.c:1557:\tret = hid_haptic_input_mapping(hdev, td-\u003ehaptic, hi, field, usage, bit,\ndrivers/hid/hid-multitouch.c-1558-\t\t\t\t max);\n--\ndrivers/hid/hid-multitouch.c=1949=static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)\n--\ndrivers/hid/hid-multitouch.c-1960-\t td-\u003emtclass.name == MT_CLS_WIN_8_KEEP_LATENCY_ON_CLOSE)) {\ndrivers/hid/hid-multitouch.c:1961:\t\tif (hid_haptic_input_configured(hdev, td-\u003ehaptic, hi) == 0)\ndrivers/hid/hid-multitouch.c-1962-\t\t\ttd-\u003eis_haptic_touchpad = false;\n"
} |
| 7/2 | 2026/10/16 21:34 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 10445 output: 32 thoughts: 13 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Analyzing the HID_HAPTIC Kconfig Entry** Alright, let's dive into the Kconfig for HID_HAPTIC. My initial focus is on understanding the scope of this configuration option within the broader HID subsystem. I'm immediately looking for its dependencies – are there specific hardware platforms it's tied to, or is it a more generic abstraction? Does it rely on any other kernel features or drivers? I'm anticipating potential interactions with input device drivers, obviously, but also considering the broader implications for power management and interrupt handling if this is a particularly low-level implementation. I need to quickly assess its level of granularity. Is it a single boolean flag, or does it offer finer-grained controls, perhaps through tristate options or even a more complex configuration structure? If the latter, I'll be particularly interested in the conditional compilation based on the hardware it is controlling. I will be looking at this with a view to assessing the current feature set for haptic interfaces and considering potential areas for improvements or optimizations. I am considering potential refactors if the current implementation could be problematic. I am thinking of the current system and whether it is a good abstraction and whether it is implemented in the best way. Essentially, I'm working through a mental checklist of potential areas of concern and areas for deeper investigation, based on my existing knowledge of the HID subsystem and kernel configuration practices. My goal is a rapid but comprehensive understanding of this option's role and potential impact within the system. |
| 8/2 | 2026/10/16 21:34 | tool | grepper |
0mArgs:{
"Expression": "HID_HAPTIC",
"PathPrefixes": [
"drivers/hid/Kconfig"
]
}Results: {
"Output": "drivers/hid/Kconfig=83=config HID_GENERIC\n--\ndrivers/hid/Kconfig-94-\ndrivers/hid/Kconfig:95:config HID_HAPTIC\ndrivers/hid/Kconfig-96-\tbool \"Haptic touchpad support\"\n"
} |
| 9/2 | 2026/10/16 21:34 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 10894 output: 33 thoughts: 23 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Analyzing the HID Driver Configuration** Right, let's dive straight in. I need to understand the configuration options for HID drivers. My immediate focus is on `drivers/hid/Kconfig`, and I'm zeroing in around line 95. That's usually where the meat of the dependency checks and prompt text for those specific drivers resides. I'm looking to quickly grasp the logical flow – which features depend on which other components, what the user-facing prompts actually say, and, by extension, how the build system guides the configuration process. This line number is just a starting point, of course; I'll likely scan up and down a bit to see the surrounding context and potential relationships with other relevant sections in the Kconfig file. I'm after the dependencies, and the logic. |
| 10/2 | 2026/10/16 21:34 | tool | read-file |
0mArgs:{
"File": "drivers/hid/Kconfig",
"FirstLine": 90,
"LineCount": 25
}Results: {
"Contents": " 90:\t\tTo compile this driver as a module, choose M here: the module\n 91:\t\twill be called hid-generic.\n 92:\t\n 93:\t\tIf unsure, say Y.\n 94:\t\n 95:\tconfig HID_HAPTIC\n 96:\t\tbool \"Haptic touchpad support\"\n 97:\t\tdefault n\n 98:\t\thelp\n 99:\t\tSupport for touchpads with force sensors and haptic actuators instead of a\n 100:\t\ttraditional button.\n 101:\t\tAdds extra parsing and FF device for the hid multitouch driver.\n 102:\t\tIt can be used for Elan 2703 haptic touchpad.\n 103:\t\n 104:\t\tIf unsure, say N.\n 105:\t\n 106:\tmenu \"Special HID drivers\"\n 107:\t\n 108:\tconfig HID_A4TECH\n 109:\t\ttristate \"A4TECH mice\"\n 110:\t\thelp\n 111:\t\tSupport for some A4TECH mice with two scroll wheels.\n 112:\t\n 113:\tconfig HID_ACCUTOUCH\n 114:\t\ttristate \"Accutouch touch device\"\n"
} |
| 11/2 | 2026/10/16 21:34 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 11460 output: 31 thoughts: 11 Thoughts: Here's my analysis of the situation: **Diving into the HID Driver Makefile** Okay, so the prompt wants me to check out the `Makefile` located in the `drivers/hid` directory. Right, I understand. This is where I'd expect to find the build configuration for Human Interface Device drivers within the kernel. Makes sense. I'll need to understand how the HID drivers are compiled and linked, what dependencies are involved, and what build options are available. This likely defines the modules themselves, and how they get built into a working driver. Let's see what we can find. I'm especially interested in how they handle different HID device classes and protocols. Perhaps I can learn something new about their build configuration in comparison to my own. |
| 12/2 | 2026/10/16 21:34 | tool | grepper |
0mArgs:{
"Expression": "HID_HAPTIC",
"PathPrefixes": [
"drivers/hid/Makefile"
]
}Results: {
"Output": "drivers/hid/Makefile=6=hid-$(CONFIG_DEBUG_FS)\t\t+= hid-debug.o\ndrivers/hid/Makefile:7:hid-$(CONFIG_HID_HAPTIC)\t+= hid-haptic.o\ndrivers/hid/Makefile-8-\n"
} |
| 13/2 | 2026/10/16 21:34 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 11735 output: 35 thoughts: 216 Thoughts: **Analyzing HID and Haptic Device Drivers for Emulation** Okay, so I'm looking at this kernel code and immediately see a dependency: `hid-$(CONFIG_HID_HAPTIC) += hid-haptic.o`. Right, that means `hid-haptic.o` becomes part of the `hid` module when `CONFIG_HID_HAPTIC` is enabled, and clearly, `CONFIG_HID_MULTITOUCH` is leveraging this. This makes sense. My question now is about emulation: Can I reliably emulate HID devices within standard QEMU, or even leverage something like syzkaller for this? The quick answer is YES! `uhid` (the `/dev/uhid` device) provides a way, as does USB HID via Raw Gadget or using a dummy_hcd with the USB gadget interface. That's a solid foundation. And syzkaller's coverage here is impressive. It actively fuzes HID through `syz_emit_vhci` (for USB) and that `/dev/uhid` interface. Now, I need to understand how the `hid-multitouch` driver handles device matching and binding. Can `uhid` bind to `hid-multitouch`? That's the real key to see if my testing strategy will be successful. I need to dig into `hid-multitouch.c` and figure out how it identifies and binds to these devices. This is where the rubber meets the road. |
| 14/2 | 2026/10/16 21:34 | tool | grepper |
0mArgs:{
"Expression": "HID_DEVICE",
"PathPrefixes": [
"drivers/hid/hid-multitouch.c"
]
}Results: {
"Output": "drivers/hid/hid-multitouch.c=195=static void mt_post_parse(struct mt_device *td, struct mt_application *app);\n--\ndrivers/hid/hid-multitouch.c-250-\ndrivers/hid/hid-multitouch.c:251:#define MT_USB_DEVICE(v, p)\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)\ndrivers/hid/hid-multitouch.c:252:#define MT_BT_DEVICE(v, p)\tHID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)\ndrivers/hid/hid-multitouch.c-253-\n--\ndrivers/hid/hid-multitouch.c=2279=static const struct hid_device_id mt_devices[] = {\n--\ndrivers/hid/hid-multitouch.c-2298-\t{ .driver_data = MT_CLS_WIN_8_DISABLE_WAKEUP,\ndrivers/hid/hid-multitouch.c:2299:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2300-\t\t\t USB_VENDOR_ID_ASUSTEK,\n--\ndrivers/hid/hid-multitouch.c-2304-\t{ .driver_data = MT_CLS_ASUS,\ndrivers/hid/hid-multitouch.c:2305:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2306-\t\t\tUSB_VENDOR_ID_ASUSTEK,\n--\ndrivers/hid/hid-multitouch.c-2410-\t{ .driver_data = MT_CLS_EGALAX_P80H84,\ndrivers/hid/hid-multitouch.c:2411:\t\tHID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2412-\t\t\tUSB_VENDOR_ID_DWAV,\n--\ndrivers/hid/hid-multitouch.c-2416-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2417:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2418-\t\t\tUSB_VENDOR_ID_ELAN, 0x313a) },\n--\ndrivers/hid/hid-multitouch.c-2420-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2421:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2422-\t\t\tUSB_VENDOR_ID_ELAN, 0x3148) },\n--\ndrivers/hid/hid-multitouch.c-2424-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,\ndrivers/hid/hid-multitouch.c:2425:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2426-\t\t\tUSB_VENDOR_ID_ELAN, 0x32ae) },\n--\ndrivers/hid/hid-multitouch.c-2472-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,\ndrivers/hid/hid-multitouch.c:2473:\t HID_DEVICE(BUS_I2C, HID_GROUP_ANY, I2C_VENDOR_ID_GOODIX,\ndrivers/hid/hid-multitouch.c-2474-\t\t I2C_DEVICE_ID_GOODIX_01E8) },\ndrivers/hid/hid-multitouch.c-2475-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,\ndrivers/hid/hid-multitouch.c:2476:\t HID_DEVICE(BUS_I2C, HID_GROUP_ANY, I2C_VENDOR_ID_GOODIX,\ndrivers/hid/hid-multitouch.c-2477-\t\t I2C_DEVICE_ID_GOODIX_01E9) },\n--\ndrivers/hid/hid-multitouch.c-2490-\t{ .driver_data = MT_CLS_VTL,\ndrivers/hid/hid-multitouch.c:2491:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2492-\t\t\t0x347d, 0x7853) },\n--\ndrivers/hid/hid-multitouch.c-2495-\t{ .driver_data = MT_CLS_VTL,\ndrivers/hid/hid-multitouch.c:2496:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2497-\t\t\t0x35cc, 0x0104) },\n--\ndrivers/hid/hid-multitouch.c-2508-\t{ .driver_data = MT_CLS_LG,\ndrivers/hid/hid-multitouch.c:2509:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_GENERIC,\ndrivers/hid/hid-multitouch.c-2510-\t\t\tUSB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_7010) },\n--\ndrivers/hid/hid-multitouch.c-2513-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2514:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2515-\t\t\t USB_VENDOR_ID_LENOVO,\n--\ndrivers/hid/hid-multitouch.c-2519-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2520:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2521-\t\t\t USB_VENDOR_ID_LENOVO,\n--\ndrivers/hid/hid-multitouch.c-2525-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2526:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2527-\t\t\t USB_VENDOR_ID_LENOVO,\n--\ndrivers/hid/hid-multitouch.c-2531-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,\ndrivers/hid/hid-multitouch.c:2532:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2533-\t\t\t USB_VENDOR_ID_LENOVO,\n--\ndrivers/hid/hid-multitouch.c-2537-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,\ndrivers/hid/hid-multitouch.c:2538:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2539-\t\t\t USB_VENDOR_ID_LENOVO,\n--\ndrivers/hid/hid-multitouch.c-2543-\t{ .driver_data = MT_CLS_YOGABOOK9I,\ndrivers/hid/hid-multitouch.c:2544:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2545-\t\t\t USB_VENDOR_ID_LENOVO,\n--\ndrivers/hid/hid-multitouch.c-2549-\t{ .driver_data = MT_CLS_NSMU,\ndrivers/hid/hid-multitouch.c:2550:\t\tHID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2551-\t\t\tUSB_VENDOR_ID_LOGITECH,\n--\ndrivers/hid/hid-multitouch.c-2553-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,\ndrivers/hid/hid-multitouch.c:2554:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2555-\t\t\tUSB_VENDOR_ID_LOGITECH,\n--\ndrivers/hid/hid-multitouch.c-2575-\t{ .driver_data = MT_CLS_NSMU,\ndrivers/hid/hid-multitouch.c:2576:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2577-\t\t\tUSB_VENDOR_ID_NTRIG, 0x1b05) },\n--\ndrivers/hid/hid-multitouch.c-2609-\t{ .driver_data = MT_CLS_RAZER_BLADE_STEALTH,\ndrivers/hid/hid-multitouch.c:2610:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2611-\t\t\tUSB_VENDOR_ID_SYNAPTICS, 0x8323) },\n--\ndrivers/hid/hid-multitouch.c-2623-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2624:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2625-\t\t\tUSB_VENDOR_ID_SYNAPTICS, 0xcd7e) },\n--\ndrivers/hid/hid-multitouch.c-2627-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2628:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2629-\t\t\tUSB_VENDOR_ID_SYNAPTICS, 0xcddc) },\n--\ndrivers/hid/hid-multitouch.c-2631-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2632:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2633-\t\t\tUSB_VENDOR_ID_SYNAPTICS, 0xce08) },\n--\ndrivers/hid/hid-multitouch.c-2635-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,\ndrivers/hid/hid-multitouch.c:2636:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2637-\t\t\tUSB_VENDOR_ID_SYNAPTICS, 0xce09) },\n--\ndrivers/hid/hid-multitouch.c-2658-\t{ .driver_data = MT_CLS_WIN_8_KEEP_LATENCY_ON_CLOSE,\ndrivers/hid/hid-multitouch.c:2659:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2660-\t\t\tUSB_VENDOR_ID_PIXART, 0x0255) },\ndrivers/hid/hid-multitouch.c-2661-\t{ .driver_data = MT_CLS_WIN_8_KEEP_LATENCY_ON_CLOSE,\ndrivers/hid/hid-multitouch.c:2662:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2663-\t\t\tUSB_VENDOR_ID_PIXART, 0x0274) },\n--\ndrivers/hid/hid-multitouch.c-2671-\t{ .driver_data = MT_CLS_WIN_8_NO_STICKY_FINGERS,\ndrivers/hid/hid-multitouch.c:2672:\t\tHID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2673-\t\t\t USB_VENDOR_ID_WINBOND, USB_DEVICE_ID_TSTP_MTOUCH) },\n--\ndrivers/hid/hid-multitouch.c-2720-\t{ .driver_data = MT_CLS_GOOGLE,\ndrivers/hid/hid-multitouch.c:2721:\t\tHID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, USB_VENDOR_ID_GOOGLE,\ndrivers/hid/hid-multitouch.c-2722-\t\t\tUSB_DEVICE_ID_GOOGLE_TOUCH_ROSE) },\ndrivers/hid/hid-multitouch.c-2723-\t{ .driver_data = MT_CLS_GOOGLE,\ndrivers/hid/hid-multitouch.c:2724:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8, USB_VENDOR_ID_GOOGLE,\ndrivers/hid/hid-multitouch.c-2725-\t\t\tUSB_DEVICE_ID_GOOGLE_WHISKERS) },\n--\ndrivers/hid/hid-multitouch.c-2728-\t{ .driver_data = MT_CLS_SIS,\ndrivers/hid/hid-multitouch.c:2729:\t\tHID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, USB_VENDOR_ID_SIS_TOUCH,\ndrivers/hid/hid-multitouch.c-2730-\t\t\tHID_ANY_ID) },\n--\ndrivers/hid/hid-multitouch.c-2733-\t{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,\ndrivers/hid/hid-multitouch.c:2734:\t\tHID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2735-\t\t\t I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288) },\n--\ndrivers/hid/hid-multitouch.c-2738-\t{ .driver_data = MT_CLS_ASUS_ROG_Z13_FOLIO,\ndrivers/hid/hid-multitouch.c:2739:\t\tHID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2740-\t\t\tUSB_VENDOR_ID_ASUSTEK,\n--\ndrivers/hid/hid-multitouch.c-2743-\t/* Generic MT device */\ndrivers/hid/hid-multitouch.c:2744:\t{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },\ndrivers/hid/hid-multitouch.c-2745-\n--\ndrivers/hid/hid-multitouch.c-2747-\t{ .driver_data = MT_CLS_WIN_8,\ndrivers/hid/hid-multitouch.c:2748:\t\tHID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,\ndrivers/hid/hid-multitouch.c-2749-\t\t\tHID_ANY_ID, HID_ANY_ID) },\n"
} |
| 15/2 | 2026/10/16 21:34 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 16556 output: 38 thoughts: 1840 Thoughts: **Analyzing the HID Haptic Driver Commit**
Okay, so I'm looking at this code change and immediately I'm thinking about the device matching. `{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) }` and `HID_GROUP_MULTITOUCH_WIN_8` with `HID_BUS_ANY` – that's the key. So, this driver is clearly designed to work with multi-touch haptic devices, potentially on various buses, right? Specifically, anything matching the HID multi-touch interface definition, regardless of vendor or product ID, maybe through uhid or USB devices?
Now, let's dive into the commit diff itself. It's focused on the `hid-haptic.c` driver, specifically around resource management and cleanup. The main change seems to be a refactoring of how the haptic device's resources are handled during unbinding and driver removal. I see a new function `hid_haptic_devm_release` being introduced. This is interesting, because it appears to be leveraging the device-managed resource framework. The comment indicates a significant shift: `hid_haptic_devm_release()` cleans up everything when the driver is unbound, which is a better approach.
Let's break down the changes: The original `hid_haptic_destroy` has been significantly simplified. It now just sets `ff->private = NULL;`, essentially disconnecting the Force Feedback subsystem's pointer. The real cleanup is now handled by the new `hid_haptic_devm_release` function, which is called through the device resource management system.
I can see that the new function's job is to ensure the workqueue is drained before any cleanup. The `haptic->wq` workqueue is destroyed, the `dev->ff->private` pointer is nulled, and the device reference is released. This avoids any race conditions when the force feedback subsystem dereferences the internal pointers. This is a good design change, since the old destroy routine would just free some data, and not handle the unbind case at all.
Also, I'm noticing that the hdev is put at the correct place, after the haptic resources are freed. Further, the input device gets `input_get_device` in `hid_haptic_init` function, and is released on devm_release, so that concurrent releases don't occur. That makes sense, because concurrent unbind/destroy and remove calls are a potential source of errors and bugs!
Finally, I see that the code is making an effort to prevent double-frees. The `devm_add_action` call in `hid_haptic_init` ties the cleanup to the device's lifecycle. `hid_haptic_init` adds the `hid_haptic_devm_release` action to `devm`, which is called during device unbind, which is a very safe method! It's a proper use of the device resource management system, and I approve. This is a thoughtful and important improvement in the robustness of the haptic driver.
|
| 16/2 | 2026/10/16 21:35 | tool | read-file |
0mArgs:{
"File": "drivers/hid/hid-haptic.c",
"FirstLine": 430,
"LineCount": 90
}Results: {
"Contents": " 430:\t\tif (dev)\n 431:\t\t\tinput_put_device(dev);\n 432:\t\n 433:\t\tmodule_put(THIS_MODULE);\n 434:\t}\n 435:\t\n 436:\tint hid_haptic_init(struct hid_device *hdev,\n 437:\t\t\t struct hid_haptic_device *haptic,\n 438:\t\t\t struct input_dev *dev)\n 439:\t{\n 440:\t\tstruct ff_device *ff;\n 441:\t\tint ret = 0, r;\n 442:\t\tstruct ff_haptic_effect stop_effect = {\n 443:\t\t\t.hid_usage = HID_HP_WAVEFORMSTOP \u0026 HID_USAGE,\n 444:\t\t};\n 445:\t\tconst char *prefix = \"hid-haptic\";\n 446:\t\tchar *name;\n 447:\t\tint (*flush)(struct input_dev *dev, struct file *file);\n 448:\t\tint (*event)(struct input_dev *dev, unsigned int type,\n 449:\t\t\t unsigned int code, int value);\n 450:\t\n 451:\t\thaptic-\u003ehdev = hdev;\n 452:\t\thaptic-\u003emax_waveform_id = max(2u, haptic-\u003emax_waveform_id);\n 453:\t\thaptic-\u003emax_duration_id = max(2u, haptic-\u003emax_duration_id);\n 454:\t\n 455:\t\thaptic-\u003ehid_usage_map = kcalloc(haptic-\u003emax_waveform_id + 1,\n 456:\t\t\t\t\t\tsizeof(u16), GFP_KERNEL);\n 457:\t\tif (!haptic-\u003ehid_usage_map) {\n 458:\t\t\tret = -ENOMEM;\n 459:\t\t\tgoto exit;\n 460:\t\t}\n 461:\t\thaptic-\u003eduration_map = kcalloc(haptic-\u003emax_duration_id + 1,\n 462:\t\t\t\t\t sizeof(u32), GFP_KERNEL);\n 463:\t\tif (!haptic-\u003eduration_map) {\n 464:\t\t\tret = -ENOMEM;\n 465:\t\t\tgoto usage_map;\n 466:\t\t}\n 467:\t\n 468:\t\tif (haptic-\u003emax_waveform_id != haptic-\u003emax_duration_id)\n 469:\t\t\tdev_warn(\u0026hdev-\u003edev,\n 470:\t\t\t\t \"Haptic duration and waveform lists have different max id (%u and %u).\\n\",\n 471:\t\t\t\t haptic-\u003emax_duration_id, haptic-\u003emax_waveform_id);\n 472:\t\n 473:\t\thaptic-\u003ehid_usage_map[HID_HAPTIC_ORDINAL_WAVEFORMNONE] =\n 474:\t\t\tHID_HP_WAVEFORMNONE \u0026 HID_USAGE;\n 475:\t\thaptic-\u003ehid_usage_map[HID_HAPTIC_ORDINAL_WAVEFORMSTOP] =\n 476:\t\t\tHID_HP_WAVEFORMSTOP \u0026 HID_USAGE;\n 477:\t\n 478:\t\tmutex_init(\u0026haptic-\u003eauto_trigger_mutex);\n 479:\t\tfor (r = 0; r \u003c haptic-\u003eauto_trigger_report-\u003emaxfield; r++)\n 480:\t\t\tparse_auto_trigger_field(haptic, haptic-\u003eauto_trigger_report-\u003efield[r]);\n 481:\t\n 482:\t\thaptic-\u003einput_dev = dev;\n 483:\t\thaptic-\u003emanual_trigger_report_len =\n 484:\t\t\thid_report_len(haptic-\u003emanual_trigger_report);\n 485:\t\tmutex_init(\u0026haptic-\u003emanual_trigger_mutex);\n 486:\t\tname = kmalloc(strlen(prefix) + strlen(hdev-\u003ename) + 2, GFP_KERNEL);\n 487:\t\tif (name) {\n 488:\t\t\tsprintf(name, \"%s %s\", prefix, hdev-\u003ename);\n 489:\t\t\thaptic-\u003ewq = create_singlethread_workqueue(name);\n 490:\t\t\tkfree(name);\n 491:\t\t}\n 492:\t\tif (!haptic-\u003ewq) {\n 493:\t\t\tret = -ENOMEM;\n 494:\t\t\tgoto duration_map;\n 495:\t\t}\n 496:\t\thaptic-\u003eeffect = kzalloc_objs(struct hid_haptic_effect, FF_MAX_EFFECTS);\n 497:\t\tif (!haptic-\u003eeffect) {\n 498:\t\t\tret = -ENOMEM;\n 499:\t\t\tgoto output_queue;\n 500:\t\t}\n 501:\t\tfor (r = 0; r \u003c FF_MAX_EFFECTS; r++) {\n 502:\t\t\thaptic-\u003eeffect[r].report_buf =\n 503:\t\t\t\thid_alloc_report_buf(haptic-\u003emanual_trigger_report,\n 504:\t\t\t\t\t\t GFP_KERNEL);\n 505:\t\t\tif (!haptic-\u003eeffect[r].report_buf) {\n 506:\t\t\t\tdev_err(\u0026hdev-\u003edev,\n 507:\t\t\t\t\t\"Failed to allocate a buffer for an effect.\\n\");\n 508:\t\t\t\tret = -ENOMEM;\n 509:\t\t\t\tgoto buffer_free;\n 510:\t\t\t}\n 511:\t\t\thaptic-\u003eeffect[r].input_dev = dev;\n 512:\t\t\tINIT_WORK(\u0026haptic-\u003eeffect[r].work, haptic_work_handler);\n 513:\t\t}\n 514:\t\thaptic-\u003estop_effect.report_buf =\n 515:\t\t\thid_alloc_report_buf(haptic-\u003emanual_trigger_report,\n 516:\t\t\t\t\t GFP_KERNEL);\n 517:\t\tif (!haptic-\u003estop_effect.report_buf) {\n 518:\t\t\tdev_err(\u0026hdev-\u003edev,\n 519:\t\t\t\t\"Failed to allocate a buffer for stop effect.\\n\");\n"
} |
| 17/2 | 2026/10/16 21:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 20660 output: 31 thoughts: 38 Thoughts: Okay, let's break this down. **Investigating the Allocation of `struct hid_haptic_device`** Alright, so the task at hand is to trace where and how `struct hid_haptic_device *haptic` is allocated within the kernel's HID subsystem. My immediate thought is to use a direct approach. The most straightforward path to uncover this information is to use `grep`. I'll focus my search on the `drivers/hid` directory, which is the logical place to start looking, given the context. The objective is clear: to identify every instance where `hid_haptic_device` is used, specifically in the declaration/allocation context. This should quickly highlight the relevant code paths. The assumption is that `grep` will find all the files with this definition and give me the best chances to find the allocation of this struct. |
| 18/2 | 2026/10/16 21:35 | tool | grepper |
0mArgs:{
"Expression": "struct hid_haptic_device",
"PathPrefixes": [
"drivers/hid"
]
}Results: {
"Output": "drivers/hid/hid-haptic.c=13=void hid_haptic_feature_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.c:14:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-15-\t\t\t\tstruct hid_field *field, struct hid_usage *usage)\n--\ndrivers/hid/hid-haptic.c=49=EXPORT_SYMBOL_GPL(hid_haptic_feature_mapping);\ndrivers/hid/hid-haptic.c-50-\ndrivers/hid/hid-haptic.c:51:bool hid_haptic_check_pressure_unit(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-52-\t\t\t\t struct hid_input *hi, struct hid_field *field)\n--\ndrivers/hid/hid-haptic.c=65=int hid_haptic_input_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.c:66:\t\t\t struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-67-\t\t\t struct hid_input *hi,\n--\ndrivers/hid/hid-haptic.c=81=int hid_haptic_input_configured(struct hid_device *hdev,\ndrivers/hid/hid-haptic.c:82:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-83-\t\t\t\tstruct hid_input *hi)\n--\ndrivers/hid/hid-haptic.c=104=EXPORT_SYMBOL_GPL(hid_haptic_input_configured);\ndrivers/hid/hid-haptic.c-105-\ndrivers/hid/hid-haptic.c:106:static void parse_auto_trigger_field(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-107-\t\t\t\t struct hid_field *field)\n--\ndrivers/hid/hid-haptic.c-154-\ndrivers/hid/hid-haptic.c:155:static void fill_effect_buf(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-156-\t\t\t struct ff_haptic_effect *effect,\n--\ndrivers/hid/hid-haptic.c-208-\ndrivers/hid/hid-haptic.c:209:static void switch_mode(struct hid_device *hdev, struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-210-\t\t\tint mode)\n--\ndrivers/hid/hid-haptic.c=241=static int hid_haptic_upload_effect(struct input_dev *dev, struct ff_effect *effect,\n--\ndrivers/hid/hid-haptic.c-245-\tstruct ff_device *ff = dev-\u003eff;\ndrivers/hid/hid-haptic.c:246:\tstruct hid_haptic_device *haptic = ff-\u003eprivate;\ndrivers/hid/hid-haptic.c-247-\tint i, ordinal = 0;\n--\ndrivers/hid/hid-haptic.c-283-\ndrivers/hid/hid-haptic.c:284:static int play_effect(struct hid_device *hdev, struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-285-\t\t struct hid_haptic_effect *effect)\n--\ndrivers/hid/hid-haptic.c=302=static void haptic_work_handler(struct work_struct *work)\n--\ndrivers/hid/hid-haptic.c-309-\tstruct hid_device *hdev = input_get_drvdata(dev);\ndrivers/hid/hid-haptic.c:310:\tstruct hid_haptic_device *haptic = dev-\u003eff-\u003eprivate;\ndrivers/hid/hid-haptic.c-311-\n--\ndrivers/hid/hid-haptic.c=321=static int hid_haptic_playback(struct input_dev *dev, int effect_id, int value)\ndrivers/hid/hid-haptic.c-322-{\ndrivers/hid/hid-haptic.c:323:\tstruct hid_haptic_device *haptic = dev-\u003eff-\u003eprivate;\ndrivers/hid/hid-haptic.c-324-\n--\ndrivers/hid/hid-haptic.c=343=static int hid_haptic_erase(struct input_dev *dev, int effect_id)\ndrivers/hid/hid-haptic.c-344-{\ndrivers/hid/hid-haptic.c:345:\tstruct hid_haptic_device *haptic = dev-\u003eff-\u003eprivate;\ndrivers/hid/hid-haptic.c-346-\tstruct hid_device *hdev = input_get_drvdata(dev);\n--\ndrivers/hid/hid-haptic.c=392=static void hid_haptic_devm_release(void *data)\ndrivers/hid/hid-haptic.c-393-{\ndrivers/hid/hid-haptic.c:394:\tstruct hid_haptic_device *haptic = data;\ndrivers/hid/hid-haptic.c-395-\tstruct input_dev *dev = haptic-\u003einput_dev;\n--\ndrivers/hid/hid-haptic.c=436=int hid_haptic_init(struct hid_device *hdev,\ndrivers/hid/hid-haptic.c:437:\t\t struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-438-\t\t struct input_dev *dev)\n--\ndrivers/hid/hid-haptic.c=599=EXPORT_SYMBOL_GPL(hid_haptic_init);\ndrivers/hid/hid-haptic.c-600-\ndrivers/hid/hid-haptic.c:601:void hid_haptic_pressure_reset(struct hid_haptic_device *haptic)\ndrivers/hid/hid-haptic.c-602-{\n--\ndrivers/hid/hid-haptic.c=605=EXPORT_SYMBOL_GPL(hid_haptic_pressure_reset);\ndrivers/hid/hid-haptic.c-606-\ndrivers/hid/hid-haptic.c:607:void hid_haptic_pressure_increase(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.c-608-\t\t\t\t __s32 pressure)\n--\ndrivers/hid/hid-haptic.h=24=struct hid_haptic_effect_node {\n--\ndrivers/hid/hid-haptic.h-28-\ndrivers/hid/hid-haptic.h:29:struct hid_haptic_device {\ndrivers/hid/hid-haptic.h-30-\tstruct input_dev *input_dev;\n--\ndrivers/hid/hid-haptic.h=58=void hid_haptic_feature_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:59:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-60-\t\t\t\tstruct hid_field *field, struct hid_usage\ndrivers/hid/hid-haptic.h-61-\t\t\t\t*usage);\ndrivers/hid/hid-haptic.h:62:bool hid_haptic_check_pressure_unit(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-63-\t\t\t\t struct hid_input *hi, struct hid_field *field);\ndrivers/hid/hid-haptic.h=64=int hid_haptic_input_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:65:\t\t\t struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-66-\t\t\t struct hid_input *hi,\n--\ndrivers/hid/hid-haptic.h=69=int hid_haptic_input_configured(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:70:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-71-\t\t\t\tstruct hid_input *hi);\ndrivers/hid/hid-haptic.h:72:int hid_haptic_init(struct hid_device *hdev, struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-73-\t\t struct input_dev *dev);\ndrivers/hid/hid-haptic.h:74:void hid_haptic_handle_press_release(struct hid_haptic_device *haptic);\ndrivers/hid/hid-haptic.h:75:void hid_haptic_pressure_reset(struct hid_haptic_device *haptic);\ndrivers/hid/hid-haptic.h:76:void hid_haptic_pressure_increase(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-77-\t\t\t\t __s32 pressure);\n--\ndrivers/hid/hid-haptic.h=80=void hid_haptic_feature_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:81:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-82-\t\t\t\tstruct hid_field *field, struct hid_usage\n--\ndrivers/hid/hid-haptic.h=85=static inline\ndrivers/hid/hid-haptic.h:86:bool hid_haptic_check_pressure_unit(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-87-\t\t\t\t struct hid_input *hi, struct hid_field *field)\n--\ndrivers/hid/hid-haptic.h=92=int hid_haptic_input_mapping(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:93:\t\t\t struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-94-\t\t\t struct hid_input *hi,\n--\ndrivers/hid/hid-haptic.h=101=int hid_haptic_input_configured(struct hid_device *hdev,\ndrivers/hid/hid-haptic.h:102:\t\t\t\tstruct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-103-\t\t\t\tstruct hid_input *hi)\n--\ndrivers/hid/hid-haptic.h=107=static inline\ndrivers/hid/hid-haptic.h:108:void hid_haptic_reset(struct hid_device *hdev, struct hid_haptic_device *haptic)\ndrivers/hid/hid-haptic.h-109-{}\ndrivers/hid/hid-haptic.h=110=static inline\ndrivers/hid/hid-haptic.h:111:int hid_haptic_init(struct hid_device *hdev, struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-112-\t\t struct input_dev *dev)\n--\ndrivers/hid/hid-haptic.h=116=static inline\ndrivers/hid/hid-haptic.h:117:void hid_haptic_handle_press_release(struct hid_haptic_device *haptic) {}\ndrivers/hid/hid-haptic.h-118-static inline\ndrivers/hid/hid-haptic.h:119:bool hid_haptic_handle_input(struct hid_haptic_device *haptic)\ndrivers/hid/hid-haptic.h-120-{\n--\ndrivers/hid/hid-haptic.h=123=static inline\ndrivers/hid/hid-haptic.h:124:void hid_haptic_pressure_reset(struct hid_haptic_device *haptic) {}\ndrivers/hid/hid-haptic.h-125-static inline\ndrivers/hid/hid-haptic.h:126:void hid_haptic_pressure_increase(struct hid_haptic_device *haptic,\ndrivers/hid/hid-haptic.h-127-\t\t\t\t __s32 pressure)\n--\ndrivers/hid/hid-multitouch.c=173=struct mt_device {\n--\ndrivers/hid/hid-multitouch.c-175-\tstruct timer_list release_timer;\t/* to release sticky fingers */\ndrivers/hid/hid-multitouch.c:176:\tstruct hid_haptic_device *haptic;\t/* haptic related configuration */\ndrivers/hid/hid-multitouch.c-177-\tstruct hid_device *hdev;\t/* hid_device we're attached to */\n"
} |
| 19/2 | 2026/10/16 21:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 24108 output: 36 thoughts: 27 Thoughts: Okay, here's my summary, taking the role of the expert: **Tracing the Allocation of `td->haptic`** Alright, let's dive right in. My first thought is to pinpoint the allocation of `td->haptic` within the `hid-multitouch.c` driver. I know the general structure of these drivers pretty well, and haptic feedback is a common element. So, my initial approach will be to meticulously trace where this particular member is being allocated. I'll need to understand when and how the `td` (touch data) structure itself is initialized and how `haptic` is associated with it. I expect to find it either allocated within the main device probe function, or possibly in some helper function dealing with haptic initialization. Let's see what the code reveals. |
| 20/2 | 2026/10/16 21:35 | tool | grepper |
0mArgs:{
"Expression": "td-\u003ehaptic",
"PathPrefixes": [
"drivers/hid/hid-multitouch.c"
]
}Results: {
"Output": "drivers/hid/hid-multitouch.c=566=static void mt_feature_mapping(struct hid_device *hdev,\n--\ndrivers/hid/hid-multitouch.c-607-\ndrivers/hid/hid-multitouch.c:608:\thid_haptic_feature_mapping(hdev, td-\u003ehaptic, field, usage);\ndrivers/hid/hid-multitouch.c-609-}\n--\ndrivers/hid/hid-multitouch.c=815=static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,\n--\ndrivers/hid/hid-multitouch.c-965-\t\t\ttd-\u003eis_haptic_touchpad =\ndrivers/hid/hid-multitouch.c:966:\t\t\t\thid_haptic_check_pressure_unit(td-\u003ehaptic,\ndrivers/hid/hid-multitouch.c-967-\t\t\t\t\t\t\t hi, field);\n--\ndrivers/hid/hid-multitouch.c=1075=static void mt_sync_frame(struct mt_device *td, struct mt_application *app,\n--\ndrivers/hid/hid-multitouch.c-1089-\tif (td-\u003eis_haptic_touchpad)\ndrivers/hid/hid-multitouch.c:1090:\t\thid_haptic_pressure_reset(td-\u003ehaptic);\ndrivers/hid/hid-multitouch.c-1091-}\n--\ndrivers/hid/hid-multitouch.c=1123=static int mt_process_slot(struct mt_device *td, struct input_dev *input,\n--\ndrivers/hid/hid-multitouch.c-1242-\t\tif (td-\u003eis_haptic_touchpad)\ndrivers/hid/hid-multitouch.c:1243:\t\t\thid_haptic_pressure_increase(td-\u003ehaptic, *slot-\u003ep);\ndrivers/hid/hid-multitouch.c-1244-\n--\ndrivers/hid/hid-multitouch.c=1487=static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,\n--\ndrivers/hid/hid-multitouch.c-1556-\ndrivers/hid/hid-multitouch.c:1557:\tret = hid_haptic_input_mapping(hdev, td-\u003ehaptic, hi, field, usage, bit,\ndrivers/hid/hid-multitouch.c-1558-\t\t\t\t max);\n--\ndrivers/hid/hid-multitouch.c=1949=static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)\n--\ndrivers/hid/hid-multitouch.c-1960-\t td-\u003emtclass.name == MT_CLS_WIN_8_KEEP_LATENCY_ON_CLOSE)) {\ndrivers/hid/hid-multitouch.c:1961:\t\tif (hid_haptic_input_configured(hdev, td-\u003ehaptic, hi) == 0)\ndrivers/hid/hid-multitouch.c-1962-\t\t\ttd-\u003eis_haptic_touchpad = false;\n--\ndrivers/hid/hid-multitouch.c=2117=static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)\n--\ndrivers/hid/hid-multitouch.c-2134-\t}\ndrivers/hid/hid-multitouch.c:2135:\ttd-\u003ehaptic = devm_kzalloc(\u0026hdev-\u003edev, sizeof(*(td-\u003ehaptic)), GFP_KERNEL);\ndrivers/hid/hid-multitouch.c:2136:\tif (!td-\u003ehaptic)\ndrivers/hid/hid-multitouch.c-2137-\t\treturn -ENOMEM;\ndrivers/hid/hid-multitouch.c-2138-\ndrivers/hid/hid-multitouch.c:2139:\ttd-\u003ehaptic-\u003ehdev = hdev;\ndrivers/hid/hid-multitouch.c-2140-\ttd-\u003ehdev = hdev;\n--\ndrivers/hid/hid-multitouch.c-2208-\tif (!td-\u003eis_haptic_touchpad)\ndrivers/hid/hid-multitouch.c:2209:\t\tdevm_kfree(\u0026hdev-\u003edev, td-\u003ehaptic);\ndrivers/hid/hid-multitouch.c-2210-\n"
} |
| 21/2 | 2026/10/16 21:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 25471 output: 29 thoughts: 94 Thoughts: Here's my analysis of the code snippet, as I see it: **Digging into the Haptic Device Memory Management** Okay, so I'm looking at this line: `td->haptic = devm_kzalloc(&hdev->dev, sizeof(*(td->haptic)), GFP_KERNEL);` Right off the bat, I see `devm_kzalloc`, which means this `haptic` structure is being managed by the device resource management system. That's good, minimizes memory leaks. Now, I recall that `ff->destroy = hid_haptic_destroy;`. That's the function that's going to clean up `haptic` when the device is unbound, and if I understand the typical flow, `ff` would typically be the `input_ff_` structure? But just to be sure that the memory is all being handled correctly I'm going to look at what `input_ff_destroy(dev)` actually does; it's always worth a double-check when dealing with resource allocation and deallocation to make sure everything lines up properly. I need to refresh my memory on what that cleanup process looks like. |
| 22/2 | 2026/10/16 21:35 | tool | grepper |
0mArgs:{
"Expression": "input_ff_destroy",
"PathPrefixes": [
"drivers/input"
]
}Results: {
"Output": "drivers/input/ff-core.c=333=EXPORT_SYMBOL_GPL(input_ff_create);\n--\ndrivers/input/ff-core.c-335-/**\ndrivers/input/ff-core.c:336: * input_ff_destroy() - frees force feedback portion of input device\ndrivers/input/ff-core.c-337- * @dev: input device supporting force feedback\n--\ndrivers/input/ff-core.c-342- */\ndrivers/input/ff-core.c:343:void input_ff_destroy(struct input_dev *dev)\ndrivers/input/ff-core.c-344-{\n--\ndrivers/input/ff-core.c-356-}\ndrivers/input/ff-core.c:357:EXPORT_SYMBOL_GPL(input_ff_destroy);\n--\ndrivers/input/input.c=1635=static void input_dev_release(struct device *device)\n--\ndrivers/input/input.c-1638-\ndrivers/input/input.c:1639:\tinput_ff_destroy(dev);\ndrivers/input/input.c-1640-\tinput_mt_destroy_slots(dev);\n--\ndrivers/input/joystick/xpad.c=1945=static int xpad_init_input(struct usb_xpad *xpad)\n--\ndrivers/input/joystick/xpad.c-2049-err_destroy_ff:\ndrivers/input/joystick/xpad.c:2050:\tinput_ff_destroy(input_dev);\ndrivers/input/joystick/xpad.c-2051-err_free_input:\n--\ndrivers/input/misc/max8997_haptic.c=232=static int max8997_haptic_probe(struct platform_device *pdev)\n--\ndrivers/input/misc/max8997_haptic.c-333-err_destroy_ff:\ndrivers/input/misc/max8997_haptic.c:334:\tinput_ff_destroy(input_dev);\ndrivers/input/misc/max8997_haptic.c-335-err_put_regulator:\n--\ndrivers/input/misc/twl4030-vibra.c=174=static int twl4030_vibra_probe(struct platform_device *pdev)\n--\ndrivers/input/misc/twl4030-vibra.c-223-err_iff:\ndrivers/input/misc/twl4030-vibra.c:224:\tinput_ff_destroy(info-\u003einput_dev);\ndrivers/input/misc/twl4030-vibra.c-225-\treturn ret;\n--\ndrivers/input/misc/uinput.c=327=static int uinput_create_device(struct uinput_device *udev)\n--\ndrivers/input/misc/uinput.c-392-\ndrivers/input/misc/uinput.c:393: fail2:\tinput_ff_destroy(dev);\ndrivers/input/misc/uinput.c-394- fail1: uinput_destroy_device(udev);\n"
} |
| 23/2 | 2026/10/16 21:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 26655 output: 37 thoughts: 33 Thoughts: Here's my analysis of the provided thought process, tailored for an expert audience: **Analyzing the Input Force Feedback Destruction Mechanism** Okay, so I'm thinking, "Where does `input_ff_destroy` live again?" It's clear I'm going to jump straight into the kernel code to understand the underlying implementation. Specifically, I'm targeting the `drivers/input/ff-core.c` file. This is where the core force feedback functionality resides, so it makes sense that the function responsible for cleaning up or releasing resources associated with force feedback devices would be there. I'm focusing on line 343, as this likely points me directly to the relevant function definition or a key area of its operation. I'm expecting to find details about how force feedback effects are deallocated, device resources are released, and perhaps how the device is ultimately disconnected or put into a safe state. My goal is to quickly grasp the mechanism behind the destruction process and how it handles potential edge cases or resource leaks. |
| 24/2 | 2026/10/16 21:35 | tool | read-file |
0mArgs:{
"File": "drivers/input/ff-core.c",
"FirstLine": 340,
"LineCount": 20
}Results: {
"Contents": " 340:\t * automatically free force feedback structures when device is\n 341:\t * destroyed.\n 342:\t */\n 343:\tvoid input_ff_destroy(struct input_dev *dev)\n 344:\t{\n 345:\t\tstruct ff_device *ff = dev-\u003eff;\n 346:\t\n 347:\t\t__clear_bit(EV_FF, dev-\u003eevbit);\n 348:\t\tif (ff) {\n 349:\t\t\tif (ff-\u003edestroy)\n 350:\t\t\t\tff-\u003edestroy(ff);\n 351:\t\t\tkfree(ff-\u003eprivate);\n 352:\t\t\tkfree(ff-\u003eeffects);\n 353:\t\t\tkfree(ff);\n 354:\t\t\tdev-\u003eff = NULL;\n 355:\t\t}\n 356:\t}\n 357:\tEXPORT_SYMBOL_GPL(input_ff_destroy);\n"
} |
| 25/2 | 2026/10/16 21:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 27187 output: 37 thoughts: 1646 Thoughts: **Analyzing a Double-Free in HID Haptic Driver** Okay, let's break this down. My initial concern is with the `input_ff_destroy` function and its interaction with `hid_haptic_destroy`. I see a potential double-free scenario, and I need to confirm my understanding of the resource management here. Specifically, `input_ff_destroy` calls `kfree(ff->private)` after `ff->destroy(ff)`. The `ff->private` pointer, in this case, points to the `haptic` struct which has been allocated using `devm_kzalloc`. This is a red flag since `devm_kzalloc` allocates memory managed by the device resource management system. When the input device is released, `input_ff_destroy` gets called and attempts to `kfree` memory that `devres` is responsible for. This could result in a double-free, or a `kfree` on memory that will be freed by `devres` later. Or worse, if the input device is destroyed separately from the hid device. The patch aims to address this. The first part introduces a change to `hid_haptic_destroy`, where the `ff->private` pointer is set to `NULL` before `input_ff_destroy` is called. This prevents the `kfree(ff->private)` call from freeing the `haptic` struct prematurely. Instead, the resource cleanup is moved to a new function, `hid_haptic_devm_release`. `hid_haptic_devm_release` cleans up the resources. It ensures the workqueue is drained, and then handles releasing the resources, including the `haptic` struct, which is still pointed to by `devm_kzalloc`. It also explicitly sets `dev->ff->private = NULL` to ensure consistency in the input device's FF data. Crucially, `devm_add_action` is used in `hid_haptic_init` to register `hid_haptic_devm_release` as a resource cleanup action. It adds an action to release the resources when the device is unbound. My next step is to ensure this code path is actually reached. The `hid_haptic_init` function is key here. To understand when `hid_haptic_init` is called, I must trace its callers. It appears to be called from `hid_haptic_input_configured`, which is called by `mt_input_configured`, which is located in `hid-multitouch.c`. This is where I see the crucial conditional logic. `hid_haptic_input_configured` is called if `td->is_haptic_touchpad` is true and a specific set of multitouch classes are matched. I have to determine how `td->is_haptic_touchpad` gets set. Digging further, I find `td->is_haptic_touchpad` is set in `mt_touch_input_mapping`, specifically when dealing with the `HID_DG_TRANSDUCER_INDEX` usage. It appears `hid_haptic_check_pressure_unit`'s return value controls it. I'll need to review the related code to understand under what circumstances `hid_haptic_check_pressure_unit`, `hid_haptic_feature_mapping`, and `hid_haptic_input_mapping` return true. The first 150 lines of `hid-haptic.c` would be important to understand the haptic device. This should give me a solid grasp of whether this patch actually resolves the double-free. |
| 26/2 | 2026/10/16 21:35 | tool | read-file |
0mArgs:{
"File": "drivers/hid/hid-haptic.c",
"FirstLine": 1,
"LineCount": 100
}Results: {
"Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0-or-later\n 2:\t/*\n 3:\t * HID Haptic support for Linux\n 4:\t *\n 5:\t * Copyright (c) 2021 Angela Czubak \u003cacz@semihalf.com\u003e\n 6:\t */\n 7:\t\n 8:\t#include \u003clinux/input/mt.h\u003e\n 9:\t#include \u003clinux/module.h\u003e\n 10:\t\n 11:\t#include \"hid-haptic.h\"\n 12:\t\n 13:\tvoid hid_haptic_feature_mapping(struct hid_device *hdev,\n 14:\t\t\t\t\tstruct hid_haptic_device *haptic,\n 15:\t\t\t\t\tstruct hid_field *field, struct hid_usage *usage)\n 16:\t{\n 17:\t\tu16 usage_hid;\n 18:\t\n 19:\t\tif (usage-\u003ehid == HID_HP_AUTOTRIGGER) {\n 20:\t\t\tif (usage-\u003eusage_index \u003e= field-\u003ereport_count) {\n 21:\t\t\t\tdev_err(\u0026hdev-\u003edev,\n 22:\t\t\t\t\t\"HID_HP_AUTOTRIGGER out of range\\n\");\n 23:\t\t\t\treturn;\n 24:\t\t\t}\n 25:\t\n 26:\t\t\thid_device_io_start(hdev);\n 27:\t\t\thid_hw_request(hdev, field-\u003ereport, HID_REQ_GET_REPORT);\n 28:\t\t\thid_hw_wait(hdev);\n 29:\t\t\thid_device_io_stop(hdev);\n 30:\t\t\thaptic-\u003edefault_auto_trigger =\n 31:\t\t\t\tfield-\u003evalue[usage-\u003eusage_index];\n 32:\t\t\thaptic-\u003eauto_trigger_report = field-\u003ereport;\n 33:\t\t} else if ((usage-\u003ehid \u0026 HID_USAGE_PAGE) == HID_UP_ORDINAL) {\n 34:\t\t\tusage_hid = usage-\u003ehid \u0026 HID_USAGE;\n 35:\t\t\tswitch (field-\u003elogical) {\n 36:\t\t\tcase HID_HP_WAVEFORMLIST:\n 37:\t\t\t\tif (usage_hid \u003e haptic-\u003emax_waveform_id)\n 38:\t\t\t\t\thaptic-\u003emax_waveform_id = usage_hid;\n 39:\t\t\t\tbreak;\n 40:\t\t\tcase HID_HP_DURATIONLIST:\n 41:\t\t\t\tif (usage_hid \u003e haptic-\u003emax_duration_id)\n 42:\t\t\t\t\thaptic-\u003emax_duration_id = usage_hid;\n 43:\t\t\t\tbreak;\n 44:\t\t\tdefault:\n 45:\t\t\t\tbreak;\n 46:\t\t\t}\n 47:\t\t}\n 48:\t}\n 49:\tEXPORT_SYMBOL_GPL(hid_haptic_feature_mapping);\n 50:\t\n 51:\tbool hid_haptic_check_pressure_unit(struct hid_haptic_device *haptic,\n 52:\t\t\t\t\t struct hid_input *hi, struct hid_field *field)\n 53:\t{\n 54:\t\tif (field-\u003eunit == HID_UNIT_GRAM || field-\u003eunit == HID_UNIT_NEWTON) {\n 55:\t\t\thaptic-\u003eforce_logical_minimum = field-\u003elogical_minimum;\n 56:\t\t\thaptic-\u003eforce_physical_minimum = field-\u003ephysical_minimum;\n 57:\t\t\thaptic-\u003eforce_resolution = input_abs_get_res(hi-\u003einput,\n 58:\t\t\t\t\t\t\t\t ABS_MT_PRESSURE);\n 59:\t\t\treturn true;\n 60:\t\t}\n 61:\t\treturn false;\n 62:\t}\n 63:\tEXPORT_SYMBOL_GPL(hid_haptic_check_pressure_unit);\n 64:\t\n 65:\tint hid_haptic_input_mapping(struct hid_device *hdev,\n 66:\t\t\t\t struct hid_haptic_device *haptic,\n 67:\t\t\t\t struct hid_input *hi,\n 68:\t\t\t\t struct hid_field *field, struct hid_usage *usage,\n 69:\t\t\t\t unsigned long **bit, int *max)\n 70:\t{\n 71:\t\tif (usage-\u003ehid == HID_HP_MANUALTRIGGER) {\n 72:\t\t\thaptic-\u003emanual_trigger_report = field-\u003ereport;\n 73:\t\t\t/* we don't really want to map these fields */\n 74:\t\t\treturn -1;\n 75:\t\t}\n 76:\t\n 77:\t\treturn 0;\n 78:\t}\n 79:\tEXPORT_SYMBOL_GPL(hid_haptic_input_mapping);\n 80:\t\n 81:\tint hid_haptic_input_configured(struct hid_device *hdev,\n 82:\t\t\t\t\tstruct hid_haptic_device *haptic,\n 83:\t\t\t\t\tstruct hid_input *hi)\n 84:\t{\n 85:\t\tint error;\n 86:\t\n 87:\t\tif (hi-\u003eapplication != HID_DG_TOUCHPAD)\n 88:\t\t\treturn -1;\n 89:\t\n 90:\t\tif (!haptic-\u003eauto_trigger_report || !haptic-\u003emanual_trigger_report)\n 91:\t\t\treturn 0;\n 92:\t\n 93:\t\t__set_bit(INPUT_PROP_PRESSUREPAD, hi-\u003einput-\u003epropbit);\n 94:\t\n 95:\t\terror = hid_haptic_init(hdev, haptic, hi-\u003einput);\n 96:\t\tif (error) {\n 97:\t\t\tdev_warn(\u0026hdev-\u003edev, \"Cannot allocate haptic for %s\\n\",\n 98:\t\t\t\t hdev-\u003ename);\n 99:\t\t\treturn 0;\n 100:\t\t}\n"
} |
| 27/2 | 2026/10/16 21:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 31096 output: 29 thoughts: 1329 Thoughts: **Analyzing HID Haptic Driver Teardown and Concurrency** Okay, this is pretty straightforward HID descriptor parsing. Any HID descriptor with the right haptic usages, whether it's from a `/dev/uhid` device or a USB HID gadget, will trigger `hid_haptic_init`. Syzkaller's `/dev/uhid` descriptions are comprehensive, and since `UHID_CREATE2` takes arbitrary HID report descriptors, we're in good shape for fuzzing. When `/dev/uhid` creates a virtual HID device, the kernel parses the descriptor. If it matches a multitouch group like `HID_GROUP_MULTITOUCH`, `hid-multitouch` probes it. That triggers the `hid_haptic_input_configured` -> `hid_haptic_init` sequence. Then, when `/dev/uhid` is closed (or the device is destroyed via `UHID_DESTROY`), the driver teardown, or input device destruction, runs `hid_haptic_destroy` and `hid_haptic_devm_release`. Wait, wasn't `hid_haptic_devm_release` supposed to be a driver teardown callback, only executed on PCI hot-unplug or sysfs unbind? But, Section 2 states that *“Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) [are] executed only during physical PCI hot-unplug or manual sysfs driver unbinding."* But that's not the case here. 1. `hid_haptic_devm_release` *is* executed when the devres actions for the hid\_device run. 2. In uhid, closing the file descriptor or calling `UHID_DESTROY` tears down the HID device (`hid_destroy_device`), which releases devres! In USB gadgets, disconnecting the gadget does the same thing. So devres release *is* reachable for virtual devices from userspace without hot-unplug! 3. `hid_haptic_init` is modified and runs during device probing / input configured! 4. `hid_haptic_destroy` is modified and runs when `input_ff_destroy` is called, which is a destruction or error path. 5. What about failures in `input_ff_create` or `devm_add_action`? That's an error handling path in `hid_haptic_init` that we need to examine. 6. Force feedback playback/upload effects, like `hid_haptic_playback`, `hid_haptic_erase`, and `haptic_work_handler`, all touch `haptic` or `dev->ff->private`. Now, looking at `hid_haptic_devm_release`... Those commit comments are key. It's designed to clean up resources, run at driver unbind, and prevents a double-free of the `devres`-managed haptic struct. It drains pending work first because handlers dereference `ff->private` through the `input_dev`, so the workqueue has to be idle before we zero that pointer. It also destroys the workqueue, sets pointers to `NULL`, and puts the device and input device. So, let's look at the lifetime and concurrency issues that this patch addresses. Before the patch, `input_ff_destroy` called `ff->destroy(ff)`, which was `hid_haptic_destroy(ff)`. In `hid_haptic_destroy`, it freed several data structures and the workqueue. `input_ff_destroy` then did `kfree(ff->private)`. Wait, when is `input_ff_destroy` called? It's called by `input_unregister_device` or `input_dev_release`. Now, the patch adds `input_get_device(dev);` in `hid_haptic_init` and `if (dev) input_put_device(dev);` in `hid_haptic_devm_release`. So `hid_haptic_init` takes a reference, and `hid_haptic_devm_release` drops it. Therefore, `input_dev_release` is called *after* `hid_haptic_devm_release`. And `hid_haptic_devm_release` is called when `hdev` is unbound/destroyed! Can there be an issue if `input_unregister_device` is called before `devm_release`? Does `input_unregister_device` call `input_ff_destroy`? I need to check `input_unregister_device` more closely. |
| 28/2 | 2026/10/16 21:35 | tool | grepper |
0mArgs:{
"Expression": "input_unregister_device",
"PathPrefixes": [
"drivers/input"
]
}Results: {
"Output": "\nFull output is too long, showing 200 out of 850 lines.\nUse more precise expression or PathPrefixes if possible.\n\nNumber of matching lines per file (111 files in total):\ndrivers/input/input.c:10\ndrivers/input/joystick/a3d.c:1\ndrivers/input/joystick/adi.c:2\ndrivers/input/joystick/amijoy.c:2\ndrivers/input/joystick/analog.c:2\ndrivers/input/joystick/as5011.c:1\ndrivers/input/joystick/cobra.c:2\ndrivers/input/joystick/db9.c:2\ndrivers/input/joystick/fsia6b.c:1\ndrivers/input/joystick/gamecon.c:2\ndrivers/input/joystick/gf2k.c:1\ndrivers/input/joystick/grip.c:2\ndrivers/input/joystick/grip_mp.c:2\ndrivers/input/joystick/guillemot.c:1\ndrivers/input/joystick/iforce/iforce-serio.c:1\ndrivers/input/joystick/iforce/iforce-usb.c:1\ndrivers/input/joystick/interact.c:1\ndrivers/input/joystick/magellan.c:1\ndrivers/input/joystick/maplecontrol.c:1\ndrivers/input/joystick/n64joy.c:1\ndrivers/input/joystick/sidewinder.c:2\ndrivers/input/joystick/spaceball.c:1\ndrivers/input/joystick/spaceorb.c:1\ndrivers/input/joystick/stinger.c:1\ndrivers/input/joystick/tmdc.c:2\ndrivers/input/joystick/turbografx.c:2\ndrivers/input/joystick/twidjoy.c:1\ndrivers/input/joystick/walkera0701.c:1\ndrivers/input/joystick/warrior.c:1\ndrivers/input/joystick/xpad.c:1\ndrivers/input/joystick/zhenhua.c:1\ndrivers/input/keyboard/atakbd.c:1\ndrivers/input/keyboard/atkbd.c:6\ndrivers/input/keyboard/hil_kbd.c:1\ndrivers/input/keyboard/hilkbd.c:1\ndrivers/input/keyboard/lkkbd.c:1\ndrivers/input/keyboard/locomokbd.c:1\ndrivers/input/keyboard/maple_keyb.c:1\ndrivers/input/keyboard/newtonkbd.c:1\ndrivers/input/keyboard/omap-keypad.c:2\ndrivers/input/keyboard/sh_keysc.c:1\ndrivers/input/keyboard/stowaway.c:1\ndrivers/input/keyboard/sunkbd.c:1\ndrivers/input/keyboard/xtkbd.c:1\ndrivers/input/misc/88pm80x_onkey.c:1\ndrivers/input/misc/ati_remote2.c:1\ndrivers/input/misc/cm109.c:1\ndrivers/input/misc/cma3000_d0x.c:1\ndrivers/input/misc/da9052_onkey.c:1\ndrivers/input/misc/da9055_onkey.c:1\n... and 61 more files\n\ndrivers/input/input.c=1944=EXPORT_SYMBOL_GPL(input_class);\n--\ndrivers/input/input.c-1951- * NOTE: Use input_free_device() to free devices that have not been\ndrivers/input/input.c:1952: * registered; input_unregister_device() should be used for already\ndrivers/input/input.c-1953- * registered devices.\n--\ndrivers/input/input.c=2063=EXPORT_SYMBOL(devm_input_allocate_device);\n--\ndrivers/input/input.c-2070- * was not called yet or if it failed. Once device was registered\ndrivers/input/input.c:2071: * use input_unregister_device() and memory will be freed once last\ndrivers/input/input.c-2072- * reference to the device is dropped.\n--\ndrivers/input/input.c=2239=static void input_cleanse_bitmasks(struct input_dev *dev)\n--\ndrivers/input/input.c-2250-\ndrivers/input/input.c:2251:static void __input_unregister_device(struct input_dev *dev)\ndrivers/input/input.c-2252-{\n--\ndrivers/input/input.c=2274=static void devm_input_device_unregister(struct device *dev, void *res)\n--\ndrivers/input/input.c-2280-\t\t__func__, dev_name(\u0026input-\u003edev));\ndrivers/input/input.c:2281:\t__input_unregister_device(input);\ndrivers/input/input.c-2282-}\n--\ndrivers/input/input.c=2333=static int input_device_tune_vals(struct input_dev *dev)\n--\ndrivers/input/input.c-2370- * Once device has been successfully registered it can be unregistered\ndrivers/input/input.c:2371: * with input_unregister_device(); input_free_device() should not be\ndrivers/input/input.c-2372- * called in this case.\n--\ndrivers/input/input.c=2469=EXPORT_SYMBOL(input_register_device);\n--\ndrivers/input/input.c-2471-/**\ndrivers/input/input.c:2472: * input_unregister_device - unregister previously registered device\ndrivers/input/input.c-2473- * @dev: device to be unregistered\n--\ndrivers/input/input.c-2477- */\ndrivers/input/input.c:2478:void input_unregister_device(struct input_dev *dev)\ndrivers/input/input.c-2479-{\n--\ndrivers/input/input.c-2484-\t\t\t\t\tdev));\ndrivers/input/input.c:2485:\t\t__input_unregister_device(dev);\ndrivers/input/input.c-2486-\t\t/*\n--\ndrivers/input/input.c-2490-\t} else {\ndrivers/input/input.c:2491:\t\t__input_unregister_device(dev);\ndrivers/input/input.c-2492-\t\tinput_put_device(dev);\n--\ndrivers/input/input.c-2494-}\ndrivers/input/input.c:2495:EXPORT_SYMBOL(input_unregister_device);\ndrivers/input/input.c-2496-\n--\ndrivers/input/joystick/a3d.c=374=static void a3d_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/a3d.c-377-\ndrivers/input/joystick/a3d.c:378:\tinput_unregister_device(a3d-\u003edev);\ndrivers/input/joystick/a3d.c-379-\tif (a3d-\u003eadc)\n--\ndrivers/input/joystick/adi.c=453=static int adi_connect(struct gameport *gameport, struct gameport_driver *drv)\n--\ndrivers/input/joystick/adi.c-513-\t\tif (port-\u003eadi[i].length \u003e 0) {\ndrivers/input/joystick/adi.c:514:\t\t\tinput_unregister_device(port-\u003eadi[i].dev);\ndrivers/input/joystick/adi.c-515-\t\t\tport-\u003eadi[i].dev = NULL;\n--\ndrivers/input/joystick/adi.c=526=static void adi_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/adi.c-532-\t\tif (port-\u003eadi[i].length \u003e 0)\ndrivers/input/joystick/adi.c:533:\t\t\tinput_unregister_device(port-\u003eadi[i].dev);\ndrivers/input/joystick/adi.c-534-\tgameport_close(gameport);\n--\ndrivers/input/joystick/amijoy.c=86=static int __init amijoy_init(void)\n--\ndrivers/input/joystick/amijoy.c-138-\t\tif (amijoy[i]) {\ndrivers/input/joystick/amijoy.c:139:\t\t\tinput_unregister_device(amijoy_dev[i]);\ndrivers/input/joystick/amijoy.c-140-\t\t\trelease_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);\n--\ndrivers/input/joystick/amijoy.c=145=static void __exit amijoy_exit(void)\n--\ndrivers/input/joystick/amijoy.c-150-\t\tif (amijoy[i]) {\ndrivers/input/joystick/amijoy.c:151:\t\t\tinput_unregister_device(amijoy_dev[i]);\ndrivers/input/joystick/amijoy.c-152-\t\t\trelease_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);\n--\ndrivers/input/joystick/analog.c=579=static int analog_connect(struct gameport *gameport, struct gameport_driver *drv)\n--\ndrivers/input/joystick/analog.c-610-\t\tif (port-\u003eanalog[i].mask)\ndrivers/input/joystick/analog.c:611:\t\t\tinput_unregister_device(port-\u003eanalog[i].dev);\ndrivers/input/joystick/analog.c-612- fail2:\tgameport_close(gameport);\n--\ndrivers/input/joystick/analog.c=618=static void analog_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/analog.c-624-\t\tif (port-\u003eanalog[i].mask)\ndrivers/input/joystick/analog.c:625:\t\t\tinput_unregister_device(port-\u003eanalog[i].dev);\ndrivers/input/joystick/analog.c-626-\tgameport_close(gameport);\n--\ndrivers/input/joystick/as5011.c=328=static void as5011_remove(struct i2c_client *client)\n--\ndrivers/input/joystick/as5011.c-334-\ndrivers/input/joystick/as5011.c:335:\tinput_unregister_device(as5011-\u003einput_dev);\ndrivers/input/joystick/as5011.c-336-\tkfree(as5011);\n--\ndrivers/input/joystick/cobra.c=136=static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)\n--\ndrivers/input/joystick/cobra.c-214-\t\tif (cobra-\u003edev[i])\ndrivers/input/joystick/cobra.c:215:\t\t\tinput_unregister_device(cobra-\u003edev[i]);\ndrivers/input/joystick/cobra.c-216- fail2:\tgameport_close(gameport);\n--\ndrivers/input/joystick/cobra.c=222=static void cobra_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/cobra.c-228-\t\tif ((cobra-\u003eexists \u003e\u003e i) \u0026 1)\ndrivers/input/joystick/cobra.c:229:\t\t\tinput_unregister_device(cobra-\u003edev[i]);\ndrivers/input/joystick/cobra.c-230-\tgameport_close(gameport);\n--\ndrivers/input/joystick/db9.c=541=static void db9_attach(struct parport *pp)\n--\ndrivers/input/joystick/db9.c-641-\twhile (--i \u003e= 0)\ndrivers/input/joystick/db9.c:642:\t\tinput_unregister_device(db9-\u003edev[i]);\ndrivers/input/joystick/db9.c-643-\tkfree(db9);\n--\ndrivers/input/joystick/db9.c=648=static void db9_detach(struct parport *port)\n--\ndrivers/input/joystick/db9.c-664-\tfor (i = 0; i \u003c min(db9_modes[db9-\u003emode].n_pads, DB9_MAX_DEVICES); i++)\ndrivers/input/joystick/db9.c:665:\t\tinput_unregister_device(db9-\u003edev[i]);\ndrivers/input/joystick/db9.c-666-\tparport_unregister_device(db9-\u003epd);\n--\ndrivers/input/joystick/fsia6b.c=198=static void fsia6b_serio_disconnect(struct serio *serio)\n--\ndrivers/input/joystick/fsia6b.c-203-\tserio_set_drvdata(serio, NULL);\ndrivers/input/joystick/fsia6b.c:204:\tinput_unregister_device(fsia6b-\u003edev);\ndrivers/input/joystick/fsia6b.c-205-\tkfree(fsia6b);\n--\ndrivers/input/joystick/gamecon.c=917=static void gc_attach(struct parport *pp)\n--\ndrivers/input/joystick/gamecon.c-982-\t\tif (gc-\u003epads[i].dev)\ndrivers/input/joystick/gamecon.c:983:\t\t\tinput_unregister_device(gc-\u003epads[i].dev);\ndrivers/input/joystick/gamecon.c-984- err_free_gc:\n--\ndrivers/input/joystick/gamecon.c=990=static void gc_detach(struct parport *port)\n--\ndrivers/input/joystick/gamecon.c-1007-\t\tif (gc-\u003epads[i].dev)\ndrivers/input/joystick/gamecon.c:1008:\t\t\tinput_unregister_device(gc-\u003epads[i].dev);\ndrivers/input/joystick/gamecon.c-1009-\tparport_unregister_device(gc-\u003epd);\n--\ndrivers/input/joystick/gf2k.c=339=static void gf2k_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/gf2k.c-342-\ndrivers/input/joystick/gf2k.c:343:\tinput_unregister_device(gf2k-\u003edev);\ndrivers/input/joystick/gf2k.c-344-\tgameport_close(gameport);\n--\ndrivers/input/joystick/grip.c=279=static int grip_connect(struct gameport *gameport, struct gameport_driver *drv)\n--\ndrivers/input/joystick/grip.c-377-\t\tif (grip-\u003edev[i])\ndrivers/input/joystick/grip.c:378:\t\t\tinput_unregister_device(grip-\u003edev[i]);\ndrivers/input/joystick/grip.c-379- fail2:\tgameport_close(gameport);\n--\ndrivers/input/joystick/grip.c=385=static void grip_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/grip.c-391-\t\tif (grip-\u003edev[i])\ndrivers/input/joystick/grip.c:392:\t\t\tinput_unregister_device(grip-\u003edev[i]);\ndrivers/input/joystick/grip.c-393-\tgameport_close(gameport);\n--\ndrivers/input/joystick/grip_mp.c=358=static int get_and_decode_packet(struct grip_mp *grip, int flags)\n--\ndrivers/input/joystick/grip_mp.c-397-\t\t\t grip_name[port-\u003emode], slot);\ndrivers/input/joystick/grip_mp.c:398:\t\t\tinput_unregister_device(port-\u003edev);\ndrivers/input/joystick/grip_mp.c-399-\t\t\tport-\u003eregistered = 0;\n--\ndrivers/input/joystick/grip_mp.c=669=static void grip_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/grip_mp.c-675-\t\tif (grip-\u003eport[i]-\u003eregistered)\ndrivers/input/joystick/grip_mp.c:676:\t\t\tinput_unregister_device(grip-\u003eport[i]-\u003edev);\ndrivers/input/joystick/grip_mp.c-677-\tgameport_close(gameport);\n--\ndrivers/input/joystick/guillemot.c=245=static void guillemot_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/guillemot.c-249-\tprintk(KERN_INFO \"guillemot.c: Failed %d reads out of %d on %s\\n\", guillemot-\u003ereads, guillemot-\u003ebads, guillemot-\u003ephys);\ndrivers/input/joystick/guillemot.c:250:\tinput_unregister_device(guillemot-\u003edev);\ndrivers/input/joystick/guillemot.c-251-\tgameport_close(gameport);\n--\ndrivers/input/joystick/iforce/iforce-serio.c=213=static void iforce_serio_disconnect(struct serio *serio)\n--\ndrivers/input/joystick/iforce/iforce-serio.c-216-\ndrivers/input/joystick/iforce/iforce-serio.c:217:\tinput_unregister_device(iforce_serio-\u003eiforce.dev);\ndrivers/input/joystick/iforce/iforce-serio.c-218-\tserio_close(serio);\n--\ndrivers/input/joystick/iforce/iforce-usb.c=257=static void iforce_usb_disconnect(struct usb_interface *intf)\n--\ndrivers/input/joystick/iforce/iforce-usb.c-262-\ndrivers/input/joystick/iforce/iforce-usb.c:263:\tinput_unregister_device(iforce_usb-\u003eiforce.dev);\ndrivers/input/joystick/iforce/iforce-usb.c-264-\n--\ndrivers/input/joystick/interact.c=275=static void interact_disconnect(struct gameport *gameport)\n--\ndrivers/input/joystick/interact.c-278-\ndrivers/input/joystick/interact.c:279:\tinput_unregister_device(interact-\u003edev);\ndrivers/input/joystick/interact.c-280-\tgameport_close(gameport);\n--\ndrivers/input/joystick/magellan.c=112=static void magellan_disconnect(struct serio *serio)\n--\ndrivers/input/joystick/magellan.c-117-\tserio_set_drvdata(serio, NULL);\ndrivers/input/joystick/magellan.c:118:\tinput_unregister_device(magellan-\u003edev);\n\n"
} |
| 29/2 | 2026/10/16 21:35 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 38235 output: 36 thoughts: 24 Thoughts: Here's a breakdown of my thought process: **Diving into Input Device Unregistration** Okay, so I need to understand the mechanics of device unregistration within the input subsystem. Let's start by digging into `drivers/input/input.c`, specifically the `__input_unregister_device` function. I'm assuming this is the core function responsible for tearing down the device's presence within the input framework. I'm expecting this to handle the cleanup of resources, de-allocation of memory, and removal of links that keep the device known to the system. Understanding this function is crucial to knowing how devices are properly removed, which is critical for robust kernel behavior. I anticipate seeing interactions with other internal data structures related to managing input devices, such as the registered device list and event handlers. Time to get my hands dirty and start reading some code. Let's see what's really happening. |
| 30/2 | 2026/10/16 21:36 | tool | read-file |
0mArgs:{
"File": "drivers/input/input.c",
"FirstLine": 2250,
"LineCount": 30
}Results: {
"Contents": "2250:\t\n2251:\tstatic void __input_unregister_device(struct input_dev *dev)\n2252:\t{\n2253:\t\tstruct input_handle *handle, *next;\n2254:\t\n2255:\t\tinput_disconnect_device(dev);\n2256:\t\n2257:\t\tscoped_guard(mutex, \u0026input_mutex) {\n2258:\t\t\tlist_for_each_entry_safe(handle, next, \u0026dev-\u003eh_list, d_node)\n2259:\t\t\t\thandle-\u003ehandler-\u003edisconnect(handle);\n2260:\t\t\tWARN_ON(!list_empty(\u0026dev-\u003eh_list));\n2261:\t\n2262:\t\t\ttimer_delete_sync(\u0026dev-\u003etimer);\n2263:\t\t\tlist_del_init(\u0026dev-\u003enode);\n2264:\t\n2265:\t\t\tinput_wakeup_procfs_readers();\n2266:\t\t}\n2267:\t\n2268:\t\tif (dev-\u003eff \u0026\u0026 dev-\u003eff-\u003estop)\n2269:\t\t\tdev-\u003eff-\u003estop(dev-\u003eff);\n2270:\t\n2271:\t\tdevice_del(\u0026dev-\u003edev);\n2272:\t}\n2273:\t\n2274:\tstatic void devm_input_device_unregister(struct device *dev, void *res)\n2275:\t{\n2276:\t\tstruct input_devres *devres = res;\n2277:\t\tstruct input_dev *input = devres-\u003einput;\n2278:\t\n2279:\t\tdev_dbg(dev, \"%s: unregistering device %s\\n\",\n"
} |
| 31/2 | 2026/10/16 21:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 38925 output: 37 thoughts: 920 Thoughts: **Analyzing a Kernel Patch: A Deep Dive into HID Haptic Device Management** Okay, let's break this down. I'm looking at `drivers/input/input.c`, specifically `input_dev_release`. It's the `release` callback for an `input_dev` instance, triggered when `put_device()` reaches zero. Now, the patch focuses on addressing a memory management issue with haptic devices. I see that `input_ff_destroy` is called within `input_dev_release`. The crux of the problem lies in the interaction between the haptic device initialization (`hid_haptic_init`) and the haptic device destruction (`hid_haptic_destroy`). Initially, `hid_haptic_init` sets up `ff->destroy` to `hid_haptic_destroy` and assigns `haptic` (a memory region managed via `devm`) to `ff->private`. When `input_dev_release` gets called, `input_ff_destroy` would call `hid_haptic_destroy`, and then `kfree(ff->private)`. This `kfree` was problematic because it was freeing memory managed by `devm`. This is the core problem! This patch attempts to resolve it by employing a clever `devm_add_action` strategy. I see that, within `hid_haptic_init`, an `input_get_device(dev)` is called to increment the reference count of the input device. Then `devm_add_action` is employed to register a `hid_haptic_devm_release` function for deferred execution. Within the `hid_haptic_destroy` function, now, the patch *only* sets `ff->private = NULL;`, to stop the `kfree` call in the original function. The actual freeing of haptic memory now happens within `hid_haptic_devm_release`, which also contains a `input_put_device(dev)` call to decrement the input device's reference count. Now, I need to verify if this code is actually reachable. This patch modifies `drivers/hid/hid-haptic.c`, which, if `CONFIG_HID_HAPTIC=y`, gets compiled into the `hid` core module. And, importantly, `hid-multitouch` relies on `hid-haptic`. Aha, then it seems `uhid` is relevant. `uhid` allows creating virtual HID devices from userspace. If a device descriptor for a multitouch touchpad is provided to `uhid`, the kernel then binds `hid-multitouch`. I'm curious if `uhid` and `hid-multitouch` are compatible... Let's dig into `hid-core.c` and `uhid.c`... In `uhid`, `uhid_dev_create` calls `hid_allocate_device()`, sets the bus, and then calls `hid_add_device()`. `hid_add_device()` searches the `hid_bus_type`. This seems very promising, let me verify in `hid-multitouch.c` that the multitouch driver registers itself. |
| 32/2 | 2026/10/16 21:36 | tool | grepper |
0mArgs:{
"Expression": "module_hid_driver",
"PathPrefixes": [
"drivers/hid/hid-multitouch.c"
]
}Results: {
"Output": "drivers/hid/hid-multitouch.c=2759=static struct hid_driver mt_driver = {\n--\ndrivers/hid/hid-multitouch.c-2777-};\ndrivers/hid/hid-multitouch.c:2778:module_hid_driver(mt_driver);\n"
} |
| 33/2 | 2026/10/16 21:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 40647 output: 29 thoughts: 1490 Thoughts: **Analyzing the HID Haptic Driver's Resource Management** Okay, so `mt_driver` is registered with the HID bus, which means it'll bind to any uhid device that matches its group or vendor/product ID. We can also emulate a HID device using USB HID emulation. When a matching device is probed, `mt_probe` gets executed, which then leads to `devm_kzalloc` allocating haptic data structures, report parsing, and eventually, the haptic subsystem gets initialized via `hid_haptic_init`. `hid_haptic_init` is the key. It sets up the force feedback (FF) device and crucially, it registers `hid_haptic_devm_release` as a device memory release function using `devm_add_action`. This `devm` function ensures resources are freed automatically during device unbind or driver unloading, which is usually a safe method. But I need to be *absolutely* sure there are no race conditions or bugs here. Let's delve into the details. Looking at `hid_haptic_devm_release`: it drains the workqueue, checks if `input_dev` exists and if the ff device is still referencing the `haptic` data. Wait, the code calls `input_get_device(dev)` in `hid_haptic_init`. This ensures the `input_dev` cannot be released before `hid_haptic_devm_release` runs because it calls `input_put_device`. But what if the `dev->ff` member gets freed before `hid_haptic_devm_release` can properly execute? `input_ff_destroy(dev)` is the function responsible for that, and it's called from `input_dev_release(device)`. Since `input_dev` is refcounted due to `input_get_device` call, it means `input_dev_release` *cannot* run before the `input_put_device(dev)` is called. Okay, let's explore if `input_ff_destroy` is called from *anywhere* else, looking through the code in `drivers/input`. The function is called in `input_dev_release`, and in error paths during probe, such as `xpad_init_input` and `uinput_create_device`. Wait! Is it called when `input_unregister_device` is called? No, `__input_unregister_device` doesn't call `input_ff_destroy`. Alright, let's check the `hid_haptic_init` error path: If `devm_add_action` fails, then `input_ff_destroy(dev)` is called, but this is okay because `hid_haptic_destroy` simply sets the `ff->private` pointer to `NULL`, and the code then calls `kfree(NULL)`. Now, suppose `devm_add_action` *succeeds*, but the driver later unbinds. `devm` actions are executed in LIFO order (Last In, First Out). The `haptic` data itself was allocated via `devm_kzalloc` inside `mt_probe`, and `hid_haptic_devm_release` was added during `hid_haptic_init`, which means the release function runs *before* the `td->haptic` is freed. So it's okay - the release function frees everything it needs and then the device memory mechanism frees the haptic structure. Wait, what about the case where `input_unregister_device` is called? Who calls it in hid-multitouch or hid? Let me check where `input_unregister_device` or `hidinput_cleanup_input` is called in `drivers/hid`. |
| 34/2 | 2026/10/16 21:36 | tool | grepper |
0mArgs:{
"Expression": "input_unregister_device",
"PathPrefixes": [
"drivers/hid"
]
}Results: {
"Output": "drivers/hid/hid-alps.c=828=static void alps_remove(struct hid_device *hdev)\n--\ndrivers/hid/hid-alps.c-842-\tif (data-\u003einput2)\ndrivers/hid/hid-alps.c:843:\t\tinput_unregister_device(data-\u003einput2);\ndrivers/hid/hid-alps.c-844-}\n--\ndrivers/hid/hid-input.c=2452=void hidinput_disconnect(struct hid_device *hid)\n--\ndrivers/hid/hid-input.c-2458-\t\tif (hidinput-\u003eregistered)\ndrivers/hid/hid-input.c:2459:\t\t\tinput_unregister_device(hidinput-\u003einput);\ndrivers/hid/hid-input.c-2460-\t\telse\n--\ndrivers/hid/hid-nvidia-shield.c=861=static struct shield_device *thunderstrike_create(struct hid_device *hdev)\n--\ndrivers/hid/hid-nvidia-shield.c-917-\tif (ts-\u003ehaptics_dev)\ndrivers/hid/hid-nvidia-shield.c:918:\t\tinput_unregister_device(ts-\u003ehaptics_dev);\ndrivers/hid/hid-nvidia-shield.c-919-err_id:\n--\ndrivers/hid/hid-nvidia-shield.c=924=static void thunderstrike_destroy(struct thunderstrike *ts)\n--\ndrivers/hid/hid-nvidia-shield.c-928-\tif (ts-\u003ehaptics_dev)\ndrivers/hid/hid-nvidia-shield.c:929:\t\tinput_unregister_device(ts-\u003ehaptics_dev);\ndrivers/hid/hid-nvidia-shield.c-930-\tida_free(\u0026thunderstrike_ida, ts-\u003eid);\n--\ndrivers/hid/hid-picolcd_core.c=453=static void picolcd_exit_keys(struct picolcd_data *data)\n--\ndrivers/hid/hid-picolcd_core.c-458-\tif (idev)\ndrivers/hid/hid-picolcd_core.c:459:\t\tinput_unregister_device(idev);\ndrivers/hid/hid-picolcd_core.c-460-}\n--\ndrivers/hid/hid-steam.c=1328=static void steam_input_unregister(struct steam_device *steam)\n--\ndrivers/hid/hid-steam.c-1337-\tsynchronize_rcu();\ndrivers/hid/hid-steam.c:1338:\tinput_unregister_device(input);\ndrivers/hid/hid-steam.c-1339-}\n--\ndrivers/hid/hid-steam.c=1341=static void steam_sensors_unregister(struct steam_device *steam)\n--\ndrivers/hid/hid-steam.c-1352-\tsynchronize_rcu();\ndrivers/hid/hid-steam.c:1353:\tinput_unregister_device(sensors);\ndrivers/hid/hid-steam.c-1354-}\n--\ndrivers/hid/hid-wiimote-core.c=689=static void wiimote_modules_unload(struct wiimote_data *wdata)\n--\ndrivers/hid/hid-wiimote-core.c-706-\t\tinput_get_device(wdata-\u003einput);\ndrivers/hid/hid-wiimote-core.c:707:\t\tinput_unregister_device(wdata-\u003einput);\ndrivers/hid/hid-wiimote-core.c-708-\t}\n--\ndrivers/hid/hid-wiimote-modules.c=522=static void wiimod_accel_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-527-\ndrivers/hid/hid-wiimote-modules.c:528:\tinput_unregister_device(wdata-\u003eaccel);\ndrivers/hid/hid-wiimote-modules.c-529-\twdata-\u003eaccel = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=784=static void wiimod_ir_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-789-\ndrivers/hid/hid-wiimote-modules.c:790:\tinput_unregister_device(wdata-\u003eir);\ndrivers/hid/hid-wiimote-modules.c-791-\twdata-\u003eir = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=981=static void wiimod_nunchuk_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-986-\ndrivers/hid/hid-wiimote-modules.c:987:\tinput_unregister_device(wdata-\u003eextension.input);\ndrivers/hid/hid-wiimote-modules.c-988-\twdata-\u003eextension.input = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=1278=static void wiimod_classic_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-1283-\ndrivers/hid/hid-wiimote-modules.c:1284:\tinput_unregister_device(wdata-\u003eextension.input);\ndrivers/hid/hid-wiimote-modules.c-1285-\twdata-\u003eextension.input = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=1551=static void wiimod_bboard_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-1556-\ndrivers/hid/hid-wiimote-modules.c:1557:\tinput_unregister_device(wdata-\u003eextension.input);\ndrivers/hid/hid-wiimote-modules.c-1558-\twdata-\u003eextension.input = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=1941=static void wiimod_pro_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-1948-\ndrivers/hid/hid-wiimote-modules.c:1949:\tinput_unregister_device(wdata-\u003eextension.input);\ndrivers/hid/hid-wiimote-modules.c-1950-\twdata-\u003eextension.input = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=2172=static void wiimod_drums_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-2177-\ndrivers/hid/hid-wiimote-modules.c:2178:\tinput_unregister_device(wdata-\u003eextension.input);\ndrivers/hid/hid-wiimote-modules.c-2179-\twdata-\u003eextension.input = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=2388=static void wiimod_guitar_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-2393-\ndrivers/hid/hid-wiimote-modules.c:2394:\tinput_unregister_device(wdata-\u003eextension.input);\ndrivers/hid/hid-wiimote-modules.c-2395-\twdata-\u003eextension.input = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=2612=static void wiimod_turntable_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-2617-\ndrivers/hid/hid-wiimote-modules.c:2618:\tinput_unregister_device(wdata-\u003eextension.input);\ndrivers/hid/hid-wiimote-modules.c-2619-\twdata-\u003eextension.input = NULL;\n--\ndrivers/hid/hid-wiimote-modules.c=2839=static void wiimod_mp_remove(const struct wiimod_ops *ops,\n--\ndrivers/hid/hid-wiimote-modules.c-2844-\ndrivers/hid/hid-wiimote-modules.c:2845:\tinput_unregister_device(wdata-\u003emp);\ndrivers/hid/hid-wiimote-modules.c-2846-\twdata-\u003emp = NULL;\n--\ndrivers/hid/usbhid/usbkbd.c=374=static void usb_kbd_disconnect(struct usb_interface *intf)\n--\ndrivers/hid/usbhid/usbkbd.c-380-\t\tusb_kill_urb(kbd-\u003eirq);\ndrivers/hid/usbhid/usbkbd.c:381:\t\tinput_unregister_device(kbd-\u003edev);\ndrivers/hid/usbhid/usbkbd.c-382-\t\tusb_kill_urb(kbd-\u003eled);\n--\ndrivers/hid/usbhid/usbmouse.c=208=static void usb_mouse_disconnect(struct usb_interface *intf)\n--\ndrivers/hid/usbhid/usbmouse.c-214-\t\tusb_kill_urb(mouse-\u003eirq);\ndrivers/hid/usbhid/usbmouse.c:215:\t\tinput_unregister_device(mouse-\u003edev);\ndrivers/hid/usbhid/usbmouse.c-216-\t\tusb_free_urb(mouse-\u003eirq);\n"
} |
| 35/2 | 2026/10/16 21:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 45369 output: 38 thoughts: 849 Thoughts: **Analyzing a Potential Use-After-Free Vulnerability in HID Haptic Driver** Okay, let's break this down. It seems like we have a potential use-after-free issue in the HID haptic driver. I'm seeing a chain of events that could lead to trouble, and I need to carefully trace the reference counts and object lifetimes. First, I'm noting that `hidinput_disconnect` calls `input_unregister_device`, which eventually leads to `input_put_device` being called on the input device (`dev`). The important bit here is `hid_haptic_init` called `input_get_device(dev)` at some point, meaning there's a reference held that might not be immediately released. Now, during the device removal process, either through `hid_destroy_device` or `hid_disconnect`, `hid_haptic_devm_release` gets triggered during the `devm` cleanups. This function does a few things I'm paying close attention to: it flushes a workqueue, clears the `dev->ff->private` pointer, and crucially, calls `input_put_device(dev)`. This call is particularly interesting because if that's the *last* reference to `dev`, this will cause `input_dev_release(dev)` to run. Inside `input_dev_release`, `input_ff_destroy(dev)` is called. This, in turn, calls the force feedback's destroy function, which is `hid_haptic_destroy`. This function sets `ff->private` to NULL. But here's the kicker: `hid_haptic_devm_release` already set `dev->ff->private` to NULL. So there is a potential double-free scenario. This is suspicious. Then `kfree(ff->private)` frees the NULL. That's a textbook NULL pointer dereference. This is where things could go wrong, and it's where I need to focus my investigation. But here's a wrinkle: What happens if there's a user space file descriptor for `/dev/input/eventX` still open, even *after* `hid_haptic_devm_release` has run? This would mean the `input_dev` wouldn't be freed immediately. It would stay alive until that file descriptor is closed. When the user closes the file descriptor, `input_dev_release` would run, triggering `hid_haptic_destroy` and the subsequent `kfree` calls – including the now-potentially-NULL pointer. I need to confirm if this path can be hit. I also wonder what happens if the device is disconnected while an I/O operation is still active on `/dev/input/eventX`. Think about what happens with `EVIOCSFF` (upload effect), `EV_FF` (playback) or `EVIOCRMFF` (erase effect). I need to check the relevant function to see what happens when `ff->private` or `dev->ff->private` are NULL. So, I will examine `hid_haptic_playback`, `hid_haptic_erase`, and `hid_haptic_upload_effect`, specifically looking at the lines of code around the area 240-370 in `drivers/hid/hid-haptic.c`. I need to ensure that the code correctly handles a scenario where these pointers might be NULL, especially after `hid_haptic_devm_release` has already run. This will give me a better understanding of how the driver deals with these potential dangling pointers. |
| 36/2 | 2026/10/16 21:36 | tool | read-file |
0mArgs:{
"File": "drivers/hid/hid-haptic.c",
"FirstLine": 240,
"LineCount": 90
}Results: {
"Contents": " 240:\t\n 241:\tstatic int hid_haptic_upload_effect(struct input_dev *dev, struct ff_effect *effect,\n 242:\t\t\t\t\t struct ff_effect *old)\n 243:\t{\n 244:\t\tstruct hid_device *hdev = input_get_drvdata(dev);\n 245:\t\tstruct ff_device *ff = dev-\u003eff;\n 246:\t\tstruct hid_haptic_device *haptic = ff-\u003eprivate;\n 247:\t\tint i, ordinal = 0;\n 248:\t\tbool switch_modes = false;\n 249:\t\n 250:\t\t/* If vendor range, check vendor id and page */\n 251:\t\tif (effect-\u003eu.haptic.hid_usage \u003e= (HID_HP_VENDORWAVEFORMMIN \u0026 HID_USAGE) \u0026\u0026\n 252:\t\t effect-\u003eu.haptic.hid_usage \u003c= (HID_HP_VENDORWAVEFORMMAX \u0026 HID_USAGE) \u0026\u0026\n 253:\t\t (effect-\u003eu.haptic.vendor_id != haptic-\u003evendor_id ||\n 254:\t\t effect-\u003eu.haptic.vendor_waveform_page != haptic-\u003evendor_page))\n 255:\t\t\treturn -EINVAL;\n 256:\t\n 257:\t\t/* Check hid_usage */\n 258:\t\tfor (i = 1; i \u003c= haptic-\u003emax_waveform_id; i++) {\n 259:\t\t\tif (haptic-\u003ehid_usage_map[i] == effect-\u003eu.haptic.hid_usage) {\n 260:\t\t\t\tordinal = i;\n 261:\t\t\t\tbreak;\n 262:\t\t\t}\n 263:\t\t}\n 264:\t\tif (ordinal \u003c 1)\n 265:\t\t\treturn -EINVAL;\n 266:\t\n 267:\t\t/* Fill the buffer for the effect id */\n 268:\t\tfill_effect_buf(haptic, \u0026effect-\u003eu.haptic, \u0026haptic-\u003eeffect[effect-\u003eid],\n 269:\t\t\t\tordinal);\n 270:\t\n 271:\t\tif (effect-\u003eu.haptic.hid_usage == (HID_HP_WAVEFORMPRESS \u0026 HID_USAGE) ||\n 272:\t\t\t\teffect-\u003eu.haptic.hid_usage == (HID_HP_WAVEFORMRELEASE \u0026 HID_USAGE))\n 273:\t\t\tswitch_modes = true;\n 274:\t\n 275:\t\t/* If device is in autonomous mode, and the uploaded effect signals userspace\n 276:\t\t * wants control of the device, change modes\n 277:\t\t */\n 278:\t\tif (switch_modes \u0026\u0026 haptic-\u003emode == HID_HAPTIC_MODE_DEVICE)\n 279:\t\t\tswitch_mode(hdev, haptic, HID_HAPTIC_MODE_HOST);\n 280:\t\n 281:\t\treturn 0;\n 282:\t}\n 283:\t\n 284:\tstatic int play_effect(struct hid_device *hdev, struct hid_haptic_device *haptic,\n 285:\t\t\t struct hid_haptic_effect *effect)\n 286:\t{\n 287:\t\tint ret;\n 288:\t\n 289:\t\tret = hid_hw_output_report(hdev, effect-\u003ereport_buf,\n 290:\t\t\t\t\t haptic-\u003emanual_trigger_report_len);\n 291:\t\tif (ret \u003c 0) {\n 292:\t\t\tret = hid_hw_raw_request(hdev,\n 293:\t\t\t\t\t\t haptic-\u003emanual_trigger_report-\u003eid,\n 294:\t\t\t\t\t\t effect-\u003ereport_buf,\n 295:\t\t\t\t\t\t haptic-\u003emanual_trigger_report_len,\n 296:\t\t\t\t\t\t HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);\n 297:\t\t}\n 298:\t\n 299:\t\treturn ret;\n 300:\t}\n 301:\t\n 302:\tstatic void haptic_work_handler(struct work_struct *work)\n 303:\t{\n 304:\t\n 305:\t\tstruct hid_haptic_effect *effect = container_of(work,\n 306:\t\t\t\t\t\t\t\tstruct hid_haptic_effect,\n 307:\t\t\t\t\t\t\t\twork);\n 308:\t\tstruct input_dev *dev = effect-\u003einput_dev;\n 309:\t\tstruct hid_device *hdev = input_get_drvdata(dev);\n 310:\t\tstruct hid_haptic_device *haptic = dev-\u003eff-\u003eprivate;\n 311:\t\n 312:\t\tmutex_lock(\u0026haptic-\u003emanual_trigger_mutex);\n 313:\t\tif (effect != \u0026haptic-\u003estop_effect)\n 314:\t\t\tplay_effect(hdev, haptic, \u0026haptic-\u003estop_effect);\n 315:\t\n 316:\t\tplay_effect(hdev, haptic, effect);\n 317:\t\tmutex_unlock(\u0026haptic-\u003emanual_trigger_mutex);\n 318:\t\n 319:\t}\n 320:\t\n 321:\tstatic int hid_haptic_playback(struct input_dev *dev, int effect_id, int value)\n 322:\t{\n 323:\t\tstruct hid_haptic_device *haptic = dev-\u003eff-\u003eprivate;\n 324:\t\n 325:\t\tif (value)\n 326:\t\t\tqueue_work(haptic-\u003ewq, \u0026haptic-\u003eeffect[effect_id].work);\n 327:\t\telse\n 328:\t\t\tqueue_work(haptic-\u003ewq, \u0026haptic-\u003estop_effect.work);\n 329:\t\n"
} |
| 37/2 | 2026/10/16 21:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 48503 output: 35 thoughts: 408 Thoughts: **Analyzing Potential Race Conditions in HID Haptic Driver** Okay, let's break this down. Line 323, `hid_haptic_playback`, and line 343, `hid_haptic_erase`, they both rely on `dev->ff->private`. That's where the `hid_haptic_device` struct is stored. We also have `hid_haptic_upload_effect`, and it uses the same pointer. The critical point is if `dev->ff->private` becomes NULL. We know `hid_haptic_devm_release` can do this – specifically, when the `hdev` (HID device) is unbound or destroyed. So, if `dev->ff->private` *is* NULL, what happens when an input ioctl is issued while the input device is open? Calls like `EVIOCSFF` (set effect), or `EVIOCRMFF` (remove effect) – are those operations safely guarded against a dangling pointer? That's the real question. It could lead to a crash. We need to check those code paths carefully. Now, wait a minute... When the input device gets unregistered, especially through `input_unregister_device` in `evdev.c`, what's *its* behavior? We need to verify that `evdev` is handling the unregistration process gracefully, especially considering the interaction with the HID driver's `ff->private` data. Time to dig into `drivers/input/evdev.c` and see if there are any race conditions lurking there during device unregistration. Let's see how evdev cleans up the input device. |
| 38/2 | 2026/10/16 21:36 | tool | grepper |
0mArgs:{
"Expression": "evdev_do_ioctl",
"PathPrefixes": [
"drivers/input/evdev.c"
]
}Results: {
"Output": "drivers/input/evdev.c=994=static int evdev_get_mask(struct evdev_client *client,\n--\ndrivers/input/evdev.c-1031-\ndrivers/input/evdev.c:1032:static long evdev_do_ioctl(struct file *file, unsigned int cmd,\ndrivers/input/evdev.c-1033-\t\t\t void __user *p, int compat_mode)\n--\ndrivers/input/evdev.c=1261=static long evdev_ioctl_handler(struct file *file, unsigned int cmd,\n--\ndrivers/input/evdev.c-1276-\ndrivers/input/evdev.c:1277:\tretval = evdev_do_ioctl(file, cmd, p, compat_mode);\ndrivers/input/evdev.c-1278-\n"
} |
| 39/2 | 2026/10/16 21:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 49521 output: 37 thoughts: 26 Thoughts: Okay, here's my summary, presented as a stream of thought: **Diving into `evdev.c`** Alright, I need to get into the heart of this problem. Let's start by looking at a specific section of code. I'll zero in on lines 1032 through 1060 in `drivers/input/evdev.c`. That's a reasonable starting point, given the context. It's likely involved in the area I'm focusing on, and this section might contain the critical logic I'm seeking. Time to see what's what. |
| 40/2 | 2026/10/16 21:36 | tool | read-file |
0mArgs:{
"File": "drivers/input/evdev.c",
"FirstLine": 1032,
"LineCount": 40
}Results: {
"Contents": "1032:\tstatic long evdev_do_ioctl(struct file *file, unsigned int cmd,\n1033:\t\t\t\t void __user *p, int compat_mode)\n1034:\t{\n1035:\t\tstruct evdev_client *client = file-\u003eprivate_data;\n1036:\t\tstruct evdev *evdev = client-\u003eevdev;\n1037:\t\tstruct input_dev *dev = evdev-\u003ehandle.dev;\n1038:\t\tstruct input_absinfo abs;\n1039:\t\tstruct input_mask mask;\n1040:\t\tstruct ff_effect effect;\n1041:\t\tint __user *ip = (int __user *)p;\n1042:\t\tunsigned int i, t, u, v;\n1043:\t\tunsigned int size;\n1044:\t\tint error;\n1045:\t\n1046:\t\t/* First we check for fixed-length commands */\n1047:\t\tswitch (cmd) {\n1048:\t\n1049:\t\tcase EVIOCGVERSION:\n1050:\t\t\treturn put_user(EV_VERSION, ip);\n1051:\t\n1052:\t\tcase EVIOCGID:\n1053:\t\t\tif (copy_to_user(p, \u0026dev-\u003eid, sizeof(struct input_id)))\n1054:\t\t\t\treturn -EFAULT;\n1055:\t\t\treturn 0;\n1056:\t\n1057:\t\tcase EVIOCGREP:\n1058:\t\t\tif (!test_bit(EV_REP, dev-\u003eevbit))\n1059:\t\t\t\treturn -ENOSYS;\n1060:\t\t\tif (put_user(dev-\u003erep[REP_DELAY], ip))\n1061:\t\t\t\treturn -EFAULT;\n1062:\t\t\tif (put_user(dev-\u003erep[REP_PERIOD], ip + 1))\n1063:\t\t\t\treturn -EFAULT;\n1064:\t\t\treturn 0;\n1065:\t\n1066:\t\tcase EVIOCSREP:\n1067:\t\t\tif (!test_bit(EV_REP, dev-\u003eevbit))\n1068:\t\t\t\treturn -ENOSYS;\n1069:\t\t\tif (get_user(u, ip))\n1070:\t\t\t\treturn -EFAULT;\n1071:\t\t\tif (get_user(v, ip + 1))\n"
} |
| 41/2 | 2026/10/16 21:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 50330 output: 37 thoughts: 45 Thoughts: Okay, let's dive into this `evdev` situation. I'm curious what the implications are if `!evdev->exist` (meaning the device is unregistered). Time to dig into the source code, specifically lines 1261 through 1285 of `drivers/input/evdev.c`. I need to understand the control flow and what safeguards, if any, are in place to handle this condition. I'm going to look for any potential for unexpected behavior, resource leaks, or crashes in this scenario. This unregistered state is a critical point for understanding device lifecycle management. I'm anticipating that those lines will explain how this condition is handled, how the driver cleans up, and if there are any specific error paths I should keep in mind. Let's get to it. |
| 42/2 | 2026/10/16 21:36 | tool | read-file |
0mArgs:{
"File": "drivers/input/evdev.c",
"FirstLine": 1260,
"LineCount": 30
}Results: {
"Contents": "1260:\t\n1261:\tstatic long evdev_ioctl_handler(struct file *file, unsigned int cmd,\n1262:\t\t\t\t\tvoid __user *p, int compat_mode)\n1263:\t{\n1264:\t\tstruct evdev_client *client = file-\u003eprivate_data;\n1265:\t\tstruct evdev *evdev = client-\u003eevdev;\n1266:\t\tint retval;\n1267:\t\n1268:\t\tretval = mutex_lock_interruptible(\u0026evdev-\u003emutex);\n1269:\t\tif (retval)\n1270:\t\t\treturn retval;\n1271:\t\n1272:\t\tif (!evdev-\u003eexist || client-\u003erevoked) {\n1273:\t\t\tretval = -ENODEV;\n1274:\t\t\tgoto out;\n1275:\t\t}\n1276:\t\n1277:\t\tretval = evdev_do_ioctl(file, cmd, p, compat_mode);\n1278:\t\n1279:\t out:\n1280:\t\tmutex_unlock(\u0026evdev-\u003emutex);\n1281:\t\treturn retval;\n1282:\t}\n1283:\t\n1284:\tstatic long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)\n1285:\t{\n1286:\t\treturn evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);\n1287:\t}\n1288:\t\n1289:\t#ifdef CONFIG_COMPAT\n"
} |
| 43/2 | 2026/10/16 21:36 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 50992 output: 31 thoughts: 1766 Thoughts: **Worth Fuzzing Analysis: HID Haptic Driver Refactoring** Okay, let's break this down. First, there's a potential issue: if `evdev_ioctl_handler` returns `-ENODEV`, then we have a problem. But wait, we have to consider what happens during disconnects and driver unloads and how that interacts with in-progress ioctls and force feedback effects. Let's see what the code does. Looking closer, `input_ff_destroy(dev)` has had a key change. Originally, it called `kfree(ff->private)`. But now, the author seems to have changed this and is setting `ff->private = NULL` instead. I need to understand why. Ah, the commit message says this is about resource cleanup being handled by `hid_haptic_devm_release`. This moves the destruction of `haptic`'s internal resources from `hid_haptic_destroy()` to `hid_haptic_devm_release()` which avoids a double-free issue! Because, before, it was calling `kfree(ff->private)` on `haptic` which was allocated by `devm_kzalloc`. That sounds like a double free, which is definitely bad. Now, can this code be fuzzed? Let's go through the checklist. Reachability is key. We know HID haptic and multitouch are reachable through `/dev/uhid` or USB gadget. We can write to `/dev/uhid`, send descriptors with relevant usages, and the `hid-multitouch` driver probes, calls `hid_haptic_init()`, creates the FF device, and does all sorts of useful operations. We can interact with it via `/dev/input/event*`, upload effects, and destroy devices. So, yes, it’s easily reachable via software emulation. Wait, is this code worth fuzzing? Let's check the criteria. This isn't a non-kernel change or something that's hardware-dependent. It’s not an unreachable execution path because it's *not* just a teardown callback for physical hot-unplug. It modifies key functions: `hid_haptic_init`, `hid_haptic_destroy`, and introduces `hid_haptic_devm_release`. It also fundamentally alters lifetime management between `input_dev`, `hid_device`, and `hid_haptic_device`. By using `input_get_device` in `hid_haptic_init` and `input_put_device` in `hid_haptic_devm_release`, it is directly changing the object lifecycle of `input_dev` relative to `hid_device`! And further, if the driver unbinds, devres actions on `hdev` run `hid_haptic_devm_release` which alters lifecycle, refcounting, and cleanup order of reachable virtual HID / input devices. So, this change is not just a cleanup; it's a refactoring of reachable data structures and changes the flow. Therefore, this MUST be fuzzable! I'm pretty certain this falls under the "Core Subsystems" section. It’s accessible via virtual buses, USB gadget, etc. Now, let me check the configs. What CONFIG options are needed to make `hid-haptic.c` compile and be reachable? I should consult the Kconfig files for that. I need to make sure `HID_HAPTIC` and `HID_MULTITOUCH` are enabled to proceed! |
| 44/2 | 2026/10/16 21:37 | tool | grepper |
0mArgs:{
"Expression": "config HID_MULTITOUCH",
"PathPrefixes": [
"drivers/hid"
]
}Results: {
"Output": "drivers/hid/Kconfig=815=config HID_MONTEREY\n--\ndrivers/hid/Kconfig-819-\ndrivers/hid/Kconfig:820:config HID_MULTITOUCH\ndrivers/hid/Kconfig-821-\ttristate \"HID Multitouch panels\"\n"
} |
| 45/2 | 2026/10/16 21:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 53635 output: 34 thoughts: 23 Thoughts: Here's a first-person summary, tailored for an expert audience, of the provided prompt: **Diving into HID Configuration** Alright, let's get down to brass tacks. I need to understand something about the HID subsystem's configuration, so I'm going to jump straight into the `drivers/hid/Kconfig` file. Specifically, I'm targeting the section around lines 820 to 840. That's usually where the more granular feature settings or device-specific options tend to reside, or at least that is the region of the Kconfig file which I'd expect to find the settings I am looking for. Let's see what interesting configurations I can uncover, what the dependencies are, and what implications a change might have. Hopefully I'll be able to work through this quickly and efficiently. |
| 46/2 | 2026/10/16 21:37 | tool | read-file |
0mArgs:{
"File": "drivers/hid/Kconfig",
"FirstLine": 818,
"LineCount": 25
}Results: {
"Contents": " 818:\t\tSupport for Monterey Genius KB29E.\n 819:\t\n 820:\tconfig HID_MULTITOUCH\n 821:\t\ttristate \"HID Multitouch panels\"\n 822:\t\thelp\n 823:\t\t Generic support for HID multitouch panels.\n 824:\t\n 825:\t\t Say Y here if you have one of the following devices:\n 826:\t\t - 3M PCT touch screens\n 827:\t\t - ActionStar dual touch panels\n 828:\t\t - Apple Touch Bar on x86 MacBook Pros\n 829:\t\t - Atmel panels\n 830:\t\t - Cando dual touch panels\n 831:\t\t - Chunghwa panels\n 832:\t\t - CJTouch panels\n 833:\t\t - CVTouch panels\n 834:\t\t - Cypress TrueTouch panels\n 835:\t\t - Elan Microelectronics touch panels\n 836:\t\t - Elo TouchSystems IntelliTouch Plus panels\n 837:\t\t - GeneralTouch 'Sensing Win7-TwoFinger' panels\n 838:\t\t - GoodTouch panels\n 839:\t\t - Hanvon dual touch panels\n 840:\t\t - Ilitek dual touch panels\n 841:\t\t - IrTouch Infrared USB panels\n 842:\t\t - LG Display panels (Dell ST2220Tc)\n"
} |
| 47/2 | 2026/10/16 21:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 54238 output: 33 thoughts: 174 Thoughts: **Investigating HID_HAPTIC Configuration** Alright, let's dive into this `HID_HAPTIC` configuration option. My immediate question is, what other configurations does it depend on or, conversely, what selects it? I'll start by taking a look at `drivers/hid/Kconfig`, specifically around lines 95 to 105. Hmm, I recall reading a snippet of that file earlier, which included: ``` config HID_HAPTIC bool "Haptic touchpad support" default n help Support for touchpads with force sensors and haptic actuators instead of a traditional button. Adds extra parsing and FF device for the hid multitouch driver. It can be used for Elan 2703 haptic touchpad. If unsure, say N. ``` Okay, so I see the description, but now the critical question is dependencies. Does `HID_HAPTIC` require any other options to be enabled? To be sure, I'll expand my search and scan lines 80 to 110 of `drivers/hid/Kconfig` to get the full picture. |
| 48/2 | 2026/10/16 21:37 | tool | read-file |
0mArgs:{
"File": "drivers/hid/Kconfig",
"FirstLine": 80,
"LineCount": 35
}Results: {
"Contents": " 80:\t\tTo compile this driver as a module, choose M here: the\n 81:\t\tmodule will be called uhid.\n 82:\t\n 83:\tconfig HID_GENERIC\n 84:\t\ttristate \"Generic HID driver\"\n 85:\t\tdefault HID\n 86:\t\thelp\n 87:\t\tSupport for generic devices on the HID bus. This includes most\n 88:\t\tkeyboards and mice, joysticks, tablets and digitizers.\n 89:\t\n 90:\t\tTo compile this driver as a module, choose M here: the module\n 91:\t\twill be called hid-generic.\n 92:\t\n 93:\t\tIf unsure, say Y.\n 94:\t\n 95:\tconfig HID_HAPTIC\n 96:\t\tbool \"Haptic touchpad support\"\n 97:\t\tdefault n\n 98:\t\thelp\n 99:\t\tSupport for touchpads with force sensors and haptic actuators instead of a\n 100:\t\ttraditional button.\n 101:\t\tAdds extra parsing and FF device for the hid multitouch driver.\n 102:\t\tIt can be used for Elan 2703 haptic touchpad.\n 103:\t\n 104:\t\tIf unsure, say N.\n 105:\t\n 106:\tmenu \"Special HID drivers\"\n 107:\t\n 108:\tconfig HID_A4TECH\n 109:\t\ttristate \"A4TECH mice\"\n 110:\t\thelp\n 111:\t\tSupport for some A4TECH mice with two scroll wheels.\n 112:\t\n 113:\tconfig HID_ACCUTOUCH\n 114:\t\ttristate \"Accutouch touch device\"\n"
} |
| 49/2 | 2026/10/16 21:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 55144 output: 32 thoughts: 20 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Diving into `drivers/hid/Kconfig`** Okay, so I'm trying to grok the configuration options within the HID subsystem, specifically focusing on what's defined past line 80 in `drivers/hid/Kconfig`. My assumption is that the more foundational, core HID components are probably listed earlier in the file, and I'm interested in what comes *after* that. I'm probably looking for more specialized or newer device support, or potentially dependencies or options that relate to specific features or even vendor-specific implementations. Perhaps there are new device classes being introduced, or platform-specific configurations I haven't tracked yet. Knowing the context of those lines in the Kconfig file can help me understand the full spectrum of supported hardware and capabilities within the kernel's HID infrastructure. It could also reveal clues about recent development trends or areas of active work in that section of the driver. Let's see what’s there, shall we? |
| 50/2 | 2026/10/16 21:37 | tool | read-file |
0mArgs:{
"File": "drivers/hid/Kconfig",
"FirstLine": 1,
"LineCount": 80
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t#\n 3:\t# HID driver configuration\n 4:\t#\n 5:\tmenuconfig HID_SUPPORT\n 6:\t\tbool \"HID bus support\"\n 7:\t\tdefault y\n 8:\t\tdepends on INPUT\n 9:\t\thelp\n 10:\t\t This option adds core support for human interface device (HID).\n 11:\t\t You will also need drivers from the following menu to make use of it.\n 12:\t\n 13:\tif HID_SUPPORT\n 14:\t\n 15:\tconfig HID\n 16:\t\ttristate \"HID bus core support\"\n 17:\t\tdefault y\n 18:\t\tdepends on INPUT\n 19:\t\thelp\n 20:\t\t A human interface device (HID) is a type of computer device that\n 21:\t\t interacts directly with and takes input from humans. The term \"HID\"\n 22:\t\t most commonly used to refer to the USB-HID specification, but other\n 23:\t\t devices (such as, but not strictly limited to, Bluetooth) are\n 24:\t\t designed using HID specification (this involves certain keyboards,\n 25:\t\t mice, tablets, etc). This option adds the HID bus to the kernel,\n 26:\t\t together with generic HID layer code. The HID devices are added and\n 27:\t\t removed from the HID bus by the transport-layer drivers, such as\n 28:\t\t usbhid (USB_HID) and hidp (BT_HIDP).\n 29:\t\n 30:\t\t For docs and specs, see https://www.usb.org/developers/hidpage/\n 31:\t\n 32:\t\t If unsure, say Y.\n 33:\t\n 34:\tif HID\n 35:\t\n 36:\tconfig HID_BATTERY_STRENGTH\n 37:\t\tbool \"Battery level reporting for HID devices\"\n 38:\t\tselect POWER_SUPPLY\n 39:\t\tdefault n\n 40:\t\thelp\n 41:\t\tThis option adds support of reporting battery strength (for HID devices\n 42:\t\tthat support this feature) through power_supply class so that userspace\n 43:\t\ttools, such as upower, can display it.\n 44:\t\n 45:\tconfig HIDRAW\n 46:\t\tbool \"/dev/hidraw raw HID device support\"\n 47:\t\thelp\n 48:\t\tSay Y here if you want to support HID devices (from the USB\n 49:\t\tspecification standpoint) that aren't strictly user interface\n 50:\t\tdevices, like monitor controls and Uninterruptible Power Supplies.\n 51:\t\n 52:\t\tThis module supports these devices separately using a separate\n 53:\t\tevent interface on /dev/hidraw.\n 54:\t\n 55:\t\tThere is also a /dev/hiddev configuration option in the USB HID\n 56:\t\tconfiguration menu. In comparison to hiddev, this device does not process\n 57:\t\tthe hid events at all (no parsing, no lookups). This lets applications\n 58:\t\tto work on raw hid events when they want to, and avoid using transport-specific\n 59:\t\tuserspace libhid/libusb libraries.\n 60:\t\n 61:\t\tIf unsure, say Y.\n 62:\t\n 63:\tconfig UHID\n 64:\t\ttristate \"User-space I/O driver support for HID subsystem\"\n 65:\t\tdefault n\n 66:\t\thelp\n 67:\t\tSay Y here if you want to provide HID I/O Drivers from user-space.\n 68:\t\tThis allows to write I/O drivers in user-space and feed the data from\n 69:\t\tthe device into the kernel. The kernel parses the HID reports, loads the\n 70:\t\tcorresponding HID Device Driver or provides input devices on top of your\n 71:\t\tuser-space device.\n 72:\t\n 73:\t\tThis driver cannot be used to parse HID-reports in user-space and write\n 74:\t\tspecial HID-drivers. You should use hidraw for that.\n 75:\t\tInstead, this driver allows to write the transport-layer driver in\n 76:\t\tuser-space like USB-HID and Bluetooth-HID do in kernel-space.\n 77:\t\n 78:\t\tIf unsure, say N.\n 79:\t\n 80:\t\tTo compile this driver as a module, choose M here: the\n"
} |
| 51/2 | 2026/10/16 21:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 56525 output: 27 thoughts: 92 Thoughts: **My Initial Investigation into Force Feedback Configuration** Okay, so I'm diving into this force feedback setup. I see `HID_HAPTIC`, `HID_MULTITOUCH`, and `UHID` are all nestled under the `if HID` condition. That makes sense, common HID stuff. But what about `INPUT_FF_MEMLESS`? Hmm, where does that fit? I should probably check the force feedback configs specifically. Is there a dependency there? I will also need to review `input_ff_create` to confirm if it has any additional configs. Let me check the `drivers/input/Makefile` and see if there are any obvious connections. |
| 52/2 | 2026/10/16 21:37 | tool | grepper |
0mArgs:{
"Expression": "ff-core",
"PathPrefixes": [
"drivers/input"
]
}Results: {
"Output": "drivers/input/Makefile=8=obj-$(CONFIG_INPUT)\t\t+= input-core.o\ndrivers/input/Makefile:9:input-core-y := input.o input-compat.o input-mt.o input-poller.o ff-core.o\ndrivers/input/Makefile-10-input-core-y += touchscreen.o touch-overlay.o\n"
} |
| 53/2 | 2026/10/16 21:37 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 56884 output: 227 thoughts: 994 Thoughts: **Focus Symbol Determination for HID Haptic Touchpad Support** Okay, so I'm digging into this HID haptic touchpad stuff. My initial thought is to identify the relevant code and potential focus symbols for fuzzing. I've already established the necessary configuration options: `HID`, `HID_HAPTIC`, `HID_MULTITOUCH`, and `UHID`. I need to make sure these are correctly linked to the features required, specifically regarding force feedback. The force feedback core (`ff-core.o`) is part of `input-core.o` when `CONFIG_INPUT` is enabled, which means that `input_ff_create` is always available with `CONFIG_INPUT`. I'm now focused on the functions *modified* or *created* within `hid-haptic.c`. I'm looking closely at their characteristics to determine if they qualify as "FocusSymbols." I've got `hid_haptic_init` (modified error paths, module refcounts, devm registration), `hid_haptic_destroy` (modified, now only NULLs ff->private), and `hid_haptic_devm_release` (new static devm action callback that frees resources, drains a workqueue, clears dev->ff->private, and drops references). The wrinkle here is `hid_haptic_devm_release`. It's *static* within the `.c` file. Normally, that screams "inlined by the compiler, no symbol in vmlinux," but I know that static functions whose addresses are taken (e.g., used as a callback like `devm_add_action`) *must* have symbols. The compiler can't inline them in that case. Aha! Same goes for `hid_haptic_destroy`, because it's stored in `ff->destroy`. The exported function `hid_haptic_input_configured` which calls `hid_haptic_init` is also important. So are `hid_haptic_playback`, `hid_haptic_erase`, and `hid_haptic_upload_effect`. And I have to remember that `haptic_work_handler` is executed from the workqueue that is drained in `hid_haptic_devm_release`. I've confirmed that these `hid_haptic_*` functions are *not* ubiquitous. They're very specific to the HID haptic touchpad functionality. They're not used all over the kernel. Finally, I'm going through the triage checklist in my head. Reachability is good because virtual HID devices (via `uhid`) or USB gadget can access this code. These are refactorings and bugfixes in reachable code. None of the negative criteria (docs, hardware-only, or PCI hot-unplug teardown) apply. These are specific, non-ubiquitous functions. The necessary configurations have been double-checked, including the `CONFIG_` prefixes and Kconfig dependencies. Alright, everything checks out. Time to call `set-results`. |
| 54/2 | 2026/10/16 21:37 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"HID",
"HID_HAPTIC",
"HID_MULTITOUCH",
"UHID"
],
"FocusSymbols": [
"hid_haptic_init",
"hid_haptic_destroy",
"hid_haptic_devm_release",
"hid_haptic_input_configured"
],
"Reasoning": "The patch refactors the teardown and lifetime management of HID haptic devices by migrating resource cleanup from the input force-feedback destroy callback (hid_haptic_destroy) to a devres action (hid_haptic_devm_release), while pinning the input_dev and updating reference counting in hid_haptic_init. This code is reachable from user space via software-emulated HID interfaces (/dev/uhid and USB raw gadget / dummy_hcd) when matching multitouch haptic touchpad descriptors. Fuzzing is warranted to test object lifetimes, reference counting, and potential race conditions or regressions during device teardown.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"HID",
"HID_HAPTIC",
"HID_MULTITOUCH",
"UHID"
],
"FocusSymbols": [
"hid_haptic_init",
"hid_haptic_destroy",
"hid_haptic_devm_release",
"hid_haptic_input_configured"
],
"Reasoning": "The patch refactors the teardown and lifetime management of HID haptic devices by migrating resource cleanup from the input force-feedback destroy callback (hid_haptic_destroy) to a devres action (hid_haptic_devm_release), while pinning the input_dev and updating reference counting in hid_haptic_init. This code is reachable from user space via software-emulated HID interfaces (/dev/uhid and USB raw gadget / dummy_hcd) when matching multitouch haptic touchpad descriptors. Fuzzing is warranted to test object lifetimes, reference counting, and potential race conditions or regressions during device teardown.",
"WorthFuzzing": true
} |
| 55/1 | 2026/10/16 21:37 | action | If |
0mArgs:{
"WorthFuzzing": true
}Results: null |
| 56/2 | 2026/10/16 21:37 | agent | kmsan-evaluator |
0mModel:core Args: null Results: {
"KMSANReasoning": "The patch modifies driver lifecycle and cleanup handling in drivers/hid/hid-haptic.c by moving resource deallocation from hid_haptic_destroy() into a devres action (hid_haptic_devm_release()), adjusting module/device reference counting, and avoiding double-frees of the haptic device struct.\n\nThese changes deal strictly with resource lifetime, object referencing (get_device/put_device, input_get_device/input_put_device), workqueue draining, and preventing double-free/use-after-free conditions. Any potential regressions or bugs introduced here (e.g., use-after-free, double-free, dangling pointers, reference leaks) are standard memory lifecycle issues effectively caught by KASAN and refcount debugging.\n\nThe patch does not introduce or modify any reads of uninitialized stack, heap, or page memory, nor does it affect padding, bounds, or data exposed to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false
}Instruction: You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.
CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
a comprehensive suite of debugging tools and sanitizers, including KASAN
(out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
(locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
or page allocations) and kernel-to-user memory info-leaks.
Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.
Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.
Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
attributes, ioctl output arguments, socket options, or BPF buffers) where fields
or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
uninitialized bytes of existing buffers.
Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
dereferences, locking deadlocks, or use-after-free bugs (these are already caught
by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.
Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit 2e5400d46d5cfd4e802c6511c32bf5bf76f0a265
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Oct 16 21:34:22 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/hid/hid-haptic.c b/drivers/hid/hid-haptic.c
index 8760eeb08b2cd..109b4dfd1e65a 100644
--- a/drivers/hid/hid-haptic.c
+++ b/drivers/hid/hid-haptic.c
@@ -379,32 +379,57 @@ static int hid_haptic_erase(struct input_dev *dev, int effect_id)
static void hid_haptic_destroy(struct ff_device *ff)
{
- struct hid_haptic_device *haptic = ff->private;
- struct hid_device *hdev = haptic->hdev;
+ /*
+ * Resource cleanup is handled by hid_haptic_devm_release() which
+ * runs at driver unbind. This callback only disconnects the FF
+ * subsystem's pointer so input_ff_destroy()'s kfree(ff->private)
+ * becomes kfree(NULL), preventing a double-free of the
+ * devres-managed haptic struct.
+ */
+ ff->private = NULL;
+}
+
+static void hid_haptic_devm_release(void *data)
+{
+ struct hid_haptic_device *haptic = data;
+ struct input_dev *dev = haptic->input_dev;
int r;
- if (hdev)
- put_device(&hdev->dev);
+ /*
+ * Drain pending work first -- handlers dereference ff->private
+ * through the input_dev, so the workqueue must be idle before
+ * we NULL that pointer or free any buffers.
+ */
+ if (haptic->wq) {
+ destroy_workqueue(haptic->wq);
+ haptic->wq = NULL;
+ }
+
+ if (dev && dev->ff && dev->ff->private == haptic)
+ dev->ff->private = NULL;
+
+ if (haptic->hdev)
+ put_device(&haptic->hdev->dev);
kfree(haptic->stop_effect.report_buf);
haptic->stop_effect.report_buf = NULL;
if (haptic->effect) {
- for (r = 0; r < ff->max_effects; r++)
+ for (r = 0; r < FF_MAX_EFFECTS; r++)
kfree(haptic->effect[r].report_buf);
kfree(haptic->effect);
}
haptic->effect = NULL;
- destroy_workqueue(haptic->wq);
- haptic->wq = NULL;
-
kfree(haptic->duration_map);
haptic->duration_map = NULL;
kfree(haptic->hid_usage_map);
haptic->hid_usage_map = NULL;
+ if (dev)
+ input_put_device(dev);
+
module_put(THIS_MODULE);
}
@@ -420,7 +445,8 @@ int hid_haptic_init(struct hid_device *hdev,
const char *prefix = "hid-haptic";
char *name;
int (*flush)(struct input_dev *dev, struct file *file);
- int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
+ int (*event)(struct input_dev *dev, unsigned int type,
+ unsigned int code, int value);
haptic->hdev = hdev;
haptic->max_waveform_id = max(2u, haptic->max_waveform_id);
@@ -501,11 +527,25 @@ int hid_haptic_init(struct hid_device *hdev,
input_set_capability(dev, EV_FF, FF_HAPTIC);
+ if (!try_module_get(THIS_MODULE)) {
+ dev_err(&hdev->dev, "Failed to increase module count.\n");
+ ret = -ENODEV;
+ goto stop_buffer_free;
+ }
+ if (!get_device(&hdev->dev)) {
+ dev_err(&hdev->dev, "Failed to get hdev device.\n");
+ ret = -ENODEV;
+ module_put(THIS_MODULE);
+ goto stop_buffer_free;
+ }
+
flush = dev->flush;
event = dev->event;
ret = input_ff_create(dev, FF_MAX_EFFECTS);
if (ret) {
dev_err(&hdev->dev, "Failed to create ff device.\n");
+ put_device(&hdev->dev);
+ module_put(THIS_MODULE);
goto stop_buffer_free;
}
@@ -515,23 +555,27 @@ int hid_haptic_init(struct hid_device *hdev,
ff->playback = hid_haptic_playback;
ff->erase = hid_haptic_erase;
ff->destroy = hid_haptic_destroy;
- if (!try_module_get(THIS_MODULE)) {
- dev_err(&hdev->dev, "Failed to increase module count.\n");
- goto input_free;
- }
- if (!get_device(&hdev->dev)) {
- dev_err(&hdev->dev, "Failed to get hdev device.\n");
+
+ /*
+ * Pin the input device so it cannot be released concurrently
+ * with our devres cleanup. hid_haptic_devm_release() drops
+ * this reference after cleanup is complete.
+ */
+ input_get_device(dev);
+
+ ret = devm_add_action(&hdev->dev, hid_haptic_devm_release, haptic);
+ if (ret) {
+ input_ff_destroy(dev);
+ dev->flush = flush;
+ dev->event = event;
+ input_put_device(dev);
+ put_device(&hdev->dev);
module_put(THIS_MODULE);
- goto input_free;
+ goto stop_buffer_free;
}
+
return 0;
-input_free:
- input_ff_destroy(dev);
- /* Restore dev flush and event */
- dev->flush = flush;
- dev->event = event;
- return ret;
stop_buffer_free:
kfree(haptic->stop_effect.report_buf);
haptic->stop_effect.report_buf = NULL;
|
| 57/3 | 2026/10/16 21:37 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 3714 output: 38 thoughts: 772 Thoughts: **Analyzing the `hid-haptic.c` Patch for KMSAN Implications** Okay, so I need to figure out if this patch series necessitates a dedicated KMSAN fuzzing session. Let's break down these changes in `drivers/hid/hid-haptic.c` and see if anything jumps out. First, I see that `hid_haptic_destroy` has been significantly altered. It used to handle a lot of resource freeing, but now it simply sets `ff->private = NULL;`. The comment explains this is to prevent a double-free, which is a good sign that they're being proactive. The core resource cleanup has been shifted to `hid_haptic_devm_release`. This is the new cleanup function, and I see it's quite comprehensive, handling workqueue destruction, nulling out pointers related to effects and buffers, and using `put_device` on the hid device. Crucially, it now takes care to drain pending work first to prevent use-after-free conditions. This suggests an understanding of concurrency issues, which is important to consider in a KMSAN context. Looking further, `hid_haptic_init` shows an interesting change. `try_module_get` and `get_device` have been moved earlier in the process, and an extra ref is taken on `dev` via `input_get_device(dev)`. This kind of careful refcounting is definitely something to scrutinize with KMSAN in mind. The important thing is that a `devres` action, `hid_haptic_devm_release`, is now registered. This should ensure resources are cleaned up properly even on error, which is crucial for preventing leaks and other issues. To get a better handle on this, I should really read the code around `hid_haptic_init` to fully understand the context of these changes. I'll need to look at how all these new additions interact. Based on this preliminary analysis, the patch has the potential to introduce or resolve issues that KMSAN could expose, so a fuzzing session might be warranted. Especially considering the new workqueue handling and refcounting logic. |
| 58/3 | 2026/10/16 21:37 | tool | read-file |
0mArgs:{
"File": "drivers/hid/hid-haptic.c",
"FirstLine": 415,
"LineCount": 90
}Results: {
"Contents": " 415:\t\thaptic-\u003estop_effect.report_buf = NULL;\n 416:\t\n 417:\t\tif (haptic-\u003eeffect) {\n 418:\t\t\tfor (r = 0; r \u003c FF_MAX_EFFECTS; r++)\n 419:\t\t\t\tkfree(haptic-\u003eeffect[r].report_buf);\n 420:\t\t\tkfree(haptic-\u003eeffect);\n 421:\t\t}\n 422:\t\thaptic-\u003eeffect = NULL;\n 423:\t\n 424:\t\tkfree(haptic-\u003eduration_map);\n 425:\t\thaptic-\u003eduration_map = NULL;\n 426:\t\n 427:\t\tkfree(haptic-\u003ehid_usage_map);\n 428:\t\thaptic-\u003ehid_usage_map = NULL;\n 429:\t\n 430:\t\tif (dev)\n 431:\t\t\tinput_put_device(dev);\n 432:\t\n 433:\t\tmodule_put(THIS_MODULE);\n 434:\t}\n 435:\t\n 436:\tint hid_haptic_init(struct hid_device *hdev,\n 437:\t\t\t struct hid_haptic_device *haptic,\n 438:\t\t\t struct input_dev *dev)\n 439:\t{\n 440:\t\tstruct ff_device *ff;\n 441:\t\tint ret = 0, r;\n 442:\t\tstruct ff_haptic_effect stop_effect = {\n 443:\t\t\t.hid_usage = HID_HP_WAVEFORMSTOP \u0026 HID_USAGE,\n 444:\t\t};\n 445:\t\tconst char *prefix = \"hid-haptic\";\n 446:\t\tchar *name;\n 447:\t\tint (*flush)(struct input_dev *dev, struct file *file);\n 448:\t\tint (*event)(struct input_dev *dev, unsigned int type,\n 449:\t\t\t unsigned int code, int value);\n 450:\t\n 451:\t\thaptic-\u003ehdev = hdev;\n 452:\t\thaptic-\u003emax_waveform_id = max(2u, haptic-\u003emax_waveform_id);\n 453:\t\thaptic-\u003emax_duration_id = max(2u, haptic-\u003emax_duration_id);\n 454:\t\n 455:\t\thaptic-\u003ehid_usage_map = kcalloc(haptic-\u003emax_waveform_id + 1,\n 456:\t\t\t\t\t\tsizeof(u16), GFP_KERNEL);\n 457:\t\tif (!haptic-\u003ehid_usage_map) {\n 458:\t\t\tret = -ENOMEM;\n 459:\t\t\tgoto exit;\n 460:\t\t}\n 461:\t\thaptic-\u003eduration_map = kcalloc(haptic-\u003emax_duration_id + 1,\n 462:\t\t\t\t\t sizeof(u32), GFP_KERNEL);\n 463:\t\tif (!haptic-\u003eduration_map) {\n 464:\t\t\tret = -ENOMEM;\n 465:\t\t\tgoto usage_map;\n 466:\t\t}\n 467:\t\n 468:\t\tif (haptic-\u003emax_waveform_id != haptic-\u003emax_duration_id)\n 469:\t\t\tdev_warn(\u0026hdev-\u003edev,\n 470:\t\t\t\t \"Haptic duration and waveform lists have different max id (%u and %u).\\n\",\n 471:\t\t\t\t haptic-\u003emax_duration_id, haptic-\u003emax_waveform_id);\n 472:\t\n 473:\t\thaptic-\u003ehid_usage_map[HID_HAPTIC_ORDINAL_WAVEFORMNONE] =\n 474:\t\t\tHID_HP_WAVEFORMNONE \u0026 HID_USAGE;\n 475:\t\thaptic-\u003ehid_usage_map[HID_HAPTIC_ORDINAL_WAVEFORMSTOP] =\n 476:\t\t\tHID_HP_WAVEFORMSTOP \u0026 HID_USAGE;\n 477:\t\n 478:\t\tmutex_init(\u0026haptic-\u003eauto_trigger_mutex);\n 479:\t\tfor (r = 0; r \u003c haptic-\u003eauto_trigger_report-\u003emaxfield; r++)\n 480:\t\t\tparse_auto_trigger_field(haptic, haptic-\u003eauto_trigger_report-\u003efield[r]);\n 481:\t\n 482:\t\thaptic-\u003einput_dev = dev;\n 483:\t\thaptic-\u003emanual_trigger_report_len =\n 484:\t\t\thid_report_len(haptic-\u003emanual_trigger_report);\n 485:\t\tmutex_init(\u0026haptic-\u003emanual_trigger_mutex);\n 486:\t\tname = kmalloc(strlen(prefix) + strlen(hdev-\u003ename) + 2, GFP_KERNEL);\n 487:\t\tif (name) {\n 488:\t\t\tsprintf(name, \"%s %s\", prefix, hdev-\u003ename);\n 489:\t\t\thaptic-\u003ewq = create_singlethread_workqueue(name);\n 490:\t\t\tkfree(name);\n 491:\t\t}\n 492:\t\tif (!haptic-\u003ewq) {\n 493:\t\t\tret = -ENOMEM;\n 494:\t\t\tgoto duration_map;\n 495:\t\t}\n 496:\t\thaptic-\u003eeffect = kzalloc_objs(struct hid_haptic_effect, FF_MAX_EFFECTS);\n 497:\t\tif (!haptic-\u003eeffect) {\n 498:\t\t\tret = -ENOMEM;\n 499:\t\t\tgoto output_queue;\n 500:\t\t}\n 501:\t\tfor (r = 0; r \u003c FF_MAX_EFFECTS; r++) {\n 502:\t\t\thaptic-\u003eeffect[r].report_buf =\n 503:\t\t\t\thid_alloc_report_buf(haptic-\u003emanual_trigger_report,\n 504:\t\t\t\t\t\t GFP_KERNEL);\n"
} |
| 59/3 | 2026/10/16 21:37 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 6494 output: 235 thoughts: 989 Thoughts: **KMSAN Applicability Assessment for HID Haptic Device Lifecycle Patch** Okay, let's break this down. This patch is all about tidying up how haptic devices are torn down, particularly around the interactions between the `hid_haptic_destroy` function and the device resource management with devres. The core issue seems to be a potential double-free scenario, or resource leaks, in the existing code, specifically related to the `ff->private` field and how it's handled in both the `hid_haptic_destroy` and `input_ff_destroy` functions. The patch addresses this by moving the resource cleanup to `hid_haptic_devm_release`, ensuring proper reference counting for `input_dev` and the module, and carefully managing the workqueue to prevent races during unbinding. It's essentially a refactoring for memory safety and concurrency during device removal. Now, the important question: KMSAN? My analysis is that this patch doesn't introduce or alter any code that *could* lead to uninitialized memory reads or information leaks detectable *only* by KMSAN. We're dealing with pointer manipulations, resource tracking, and synchronization. The patch modifies existing structures' cleanup but doesn't change how we handle kernel structures passed to userspace via `copy_to_user`, `put_user`, netlink, ioctls, socket options, or BPF. We're not introducing new structures and accidentally leaving fields uninitialized and readable. Conditional logic doesn't depend on uninitialized variables. We're not allocating and initializing complex data structures incorrectly. No bounds checks or lengths are being modified in a way that would allow the surrounding code to read uninitialized bytes. The primary concerns are object lifetime (get/put/try_module_get/module_put), use-after-free, double-free vulnerabilities, and possible race conditions that result in dereferencing null pointers. However, all these problems are exactly what KASAN, lockdep, and standard kernel debugging tools are designed to catch! Refcounting errors are easily caught by those tools. KASAN is fantastic at catching UAF and double-free issues, and the workqueue interactions should be detectable through standard workqueue sanity checks. These are not uninitialized memory vulnerabilities. The rule of thumb is clear: no KMSAN unless we're dealing with *uninitialized* memory risks *that other tools won't catch*. A KMSAN session is costly. This patch simply refactors device destruction logic to improve memory safety and concurrency, but the potential problems are all well-within the scope of KASAN and other standard kernel debugging tools. Therefore, I'm confident in setting `NeedsKMSAN=false`. It's a clean, safe patch from a KMSAN perspective. |
| 60/3 | 2026/10/16 21:38 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch modifies driver lifecycle and cleanup handling in drivers/hid/hid-haptic.c by moving resource deallocation from hid_haptic_destroy() into a devres action (hid_haptic_devm_release()), adjusting module/device reference counting, and avoiding double-frees of the haptic device struct.\n\nThese changes deal strictly with resource lifetime, object referencing (get_device/put_device, input_get_device/input_put_device), workqueue draining, and preventing double-free/use-after-free conditions. Any potential regressions or bugs introduced here (e.g., use-after-free, double-free, dangling pointers, reference leaks) are standard memory lifecycle issues effectively caught by KASAN and refcount debugging.\n\nThe patch does not introduce or modify any reads of uninitialized stack, heap, or page memory, nor does it affect padding, bounds, or data exposed to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch modifies driver lifecycle and cleanup handling in drivers/hid/hid-haptic.c by moving resource deallocation from hid_haptic_destroy() into a devres action (hid_haptic_devm_release()), adjusting module/device reference counting, and avoiding double-frees of the haptic device struct.\n\nThese changes deal strictly with resource lifetime, object referencing (get_device/put_device, input_get_device/input_put_device), workqueue draining, and preventing double-free/use-after-free conditions. Any potential regressions or bugs introduced here (e.g., use-after-free, double-free, dangling pointers, reference leaks) are standard memory lifecycle issues effectively caught by KASAN and refcount debugging.\n\nThe patch does not introduce or modify any reads of uninitialized stack, heap, or page memory, nor does it affect padding, bounds, or data exposed to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false
} |
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| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
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