AI Trajectory

null

{
  "EnableConfigs": [
    "MT7925U"
  ],
  "FocusSymbols": [
    "mt7925_stop"
  ],
  "Reasoning": "The patch adds a new `mt7925_stop` function to the mt7925 Mediatek wireless driver, which cancels a delayed work before stopping the device. This is reachable via the USB interface of the driver (`MT7925U`) and fixes a potential race condition or use-after-free.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 71a3d89857508974c2bd541d6a927284e12efacd\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Jun 27 20:44:02 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/wireless/mediatek/mt76/mt7925/main.c b/drivers/net/wireless/mediatek/mt76/mt7925/main.c\nindex a9059866b70161..9156530272c826 100644\n--- a/drivers/net/wireless/mediatek/mt76/mt7925/main.c\n+++ b/drivers/net/wireless/mediatek/mt76/mt7925/main.c\n@@ -2481,10 +2481,19 @@ static void mt7925_channel_switch_rx_beacon(struct ieee80211_hw *hw,\n \t}\n }\n \n+static void mt7925_stop(struct ieee80211_hw *hw, bool suspend)\n+{\n+\tstruct mt792x_dev *dev = mt792x_hw_dev(hw);\n+\n+\tcancel_delayed_work_sync(\u0026dev-\u003emlo_pm_work);\n+\n+\tmt792x_stop(hw, suspend);\n+}\n+\n const struct ieee80211_ops mt7925_ops = {\n \t.tx = mt792x_tx,\n \t.start = mt7925_start,\n-\t.stop = mt792x_stop,\n+\t.stop = mt7925_stop,\n \t.add_interface = mt7925_add_interface,\n \t.remove_interface = mt792x_remove_interface,\n \t.config = mt7925_config,\n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": [
    "MT7925U"
  ],
  "FocusSymbols": [
    "mt7925_stop"
  ],
  "Reasoning": "The patch adds a new `mt7925_stop` function to the mt7925 Mediatek wireless driver, which cancels a delayed work before stopping the device. This is reachable via the USB interface of the driver (`MT7925U`) and fixes a potential race condition or use-after-free.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a '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.

For your convenience, here is the diff of the changes:
commit 71a3d89857508974c2bd541d6a927284e12efacd
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Jun 27 20:44:02 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/main.c b/drivers/net/wireless/mediatek/mt76/mt7925/main.c
index a9059866b70161..9156530272c826 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/main.c
@@ -2481,10 +2481,19 @@ static void mt7925_channel_switch_rx_beacon(struct ieee80211_hw *hw,
 	}
 }
 
+static void mt7925_stop(struct ieee80211_hw *hw, bool suspend)
+{
+	struct mt792x_dev *dev = mt792x_hw_dev(hw);
+
+	cancel_delayed_work_sync(&dev->mlo_pm_work);
+
+	mt792x_stop(hw, suspend);
+}
+
 const struct ieee80211_ops mt7925_ops = {
 	.tx = mt792x_tx,
 	.start = mt7925_start,
-	.stop = mt792x_stop,
+	.stop = mt7925_stop,
 	.add_interface = mt7925_add_interface,
 	.remove_interface = mt792x_remove_interface,
 	.config = mt7925_config,

gemini-3.1-pro-preview

null

null

							input: 2048
							output: 37
							thoughts: 183
						

**Analyzing a Mediatek Driver Patch**

Okay, so I'm looking at this patch for `drivers/net/wireless/mediatek/mt76/mt7925/main.c`. It's a fairly straightforward change, replacing the function pointer `mt792x_stop` with `mt7925_stop` within the `mt7925_ops` structure. The new `mt7925_stop` function, as expected, seems to wrap the original with some additional cleanup. Specifically, I see it cancels `dev->mlo_pm_work` using `cancel_delayed_work_sync` before calling the core `mt792x_stop` with the `suspend` flag. That's a standard pattern for power management in these drivers.

My immediate thought is to consider the context: is this a change we'd realistically see affecting a virtualized environment? The driver itself is `mt7925`, a Mediatek wireless component, as it says. Now I'm wondering if this is a PCI or USB driver – that detail could change how the patch might behave in virtualization, although, frankly, the impact is likely minor. I'll need to double-check that by looking at the source directory, so I'll go take a look in `drivers/net/wireless/mediatek/mt76/mt7925/` to confirm. It's usually pretty obvious from the device files.

{
  "Dir": "drivers/net/wireless/mediatek/mt76/mt7925/"
}

{
  "Files": [
    "debugfs.c",
    "init.c",
    "mac.c",
    "mac.h",
    "main.c",
    "mcu.c",
    "mcu.h",
    "mt7925.h",
    "pci.c",
    "pci_mac.c",
    "pci_mcu.c",
    "regd.c",
    "regd.h",
    "regs.h",
    "testmode.c",
    "usb.c"
  ],
  "Subdirs": null
}

gemini-3.1-pro-preview

null

null

							input: 2714
							output: 47
							thoughts: 71
						

**Analyzing the Target for Fuzzing Potential**

Okay, so I've got this target and the initial assessment reveals a couple of key files: `usb.c` and `pci.c`. The presence of a USB driver, specifically, is really interesting. That immediately screams "potential for USB gadget fuzzing in a virtualized environment!" That's a classic and powerful approach.

My next step is to get more granular. I'll need to dig into the relevant code, so let's check out `drivers/net/wireless/mediatek/mt76/mt7925/usb.c`. I need to understand how the USB interface is implemented. I'll also check the `Kconfig` files to see how the driver is configured and what options exist. This should give me a good handle on how to structure the fuzzing setup, what potential entry points exist, and any configuration dependencies I need to be aware of.

{
  "Expression": "config MT7925",
  "PathPrefix": "drivers/net/wireless/mediatek/mt76/mt7925/Kconfig"
}

{
  "Output": "drivers/net/wireless/mediatek/mt76/mt7925/Kconfig-1-# SPDX-License-Identifier: BSD-3-Clause-Clear\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig:2:config MT7925_COMMON\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig-3-\ttristate\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig-6-\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig:7:config MT7925E\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig-8-\ttristate \"MediaTek MT7925E (PCIe) support\"\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig-18-\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig:19:config MT7925U\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig-20-\ttristate \"MediaTek MT7925U (USB) support\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 3352
							output: 49
							thoughts: 144
						

**Analyzing the MT7925 Driver Updates**

Okay, so we're looking at some changes related to the MT7925 driver, specifically concerning USB support. The configuration options are defined as `MT7925E` and `MT7925U`, and we're enabling `MT7925U` presumably to exercise the USB driver functionality. The key addition here appears to be the `mt7925_stop` function. My immediate thought is, "Is that *all* that's changed?" We need to be thorough.

Alright, a quick check confirms it. The `mt7925_stop` function has been introduced and, importantly, it's being assigned to the `.stop` operation within the `mt7925_ops` structure. This is significant; it indicates the intended function for shutting down the device. Let's dig into the implementation of this new `mt7925_stop` function located in `drivers/net/wireless/mediatek/mt76/mt7925/main.c` to see exactly what's involved in this new USB implementation.

{
  "Expression": "mt7925_stop",
  "PathPrefix": "drivers/net/wireless/mediatek/mt76/mt7925/main.c"
}

{
  "Output": "drivers/net/wireless/mediatek/mt76/mt7925/main.c=1590=static int\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c:1591:mt7925_stop_sched_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-1592-{\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c=1893=static void\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c:1894:mt7925_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-1895-\t       struct ieee80211_bss_conf *link_conf)\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c=2460=static void mt7925_channel_switch_rx_beacon(struct ieee80211_hw *hw,\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-2483-\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c:2484:static void mt7925_stop(struct ieee80211_hw *hw, bool suspend)\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-2485-{\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c=2493=const struct ieee80211_ops mt7925_ops = {\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-2495-\t.start = mt7925_start,\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c:2496:\t.stop = mt7925_stop,\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-2497-\t.add_interface = mt7925_add_interface,\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-2502-\t.start_ap = mt7925_start_ap,\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c:2503:\t.stop_ap = mt7925_stop_ap,\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-2504-\t.sta_state = mt76_sta_state,\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-2530-\t.sched_scan_start = mt7925_start_sched_scan,\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c:2531:\t.sched_scan_stop = mt7925_stop_sched_scan,\ndrivers/net/wireless/mediatek/mt76/mt7925/main.c-2532-\tCFG80211_TESTMODE_CMD(mt7925_testmode_cmd)\n"
}

gemini-3.1-pro-preview

null

null

							input: 4726
							output: 48
							thoughts: 110
						

**Fuzzing the MT7925 Driver: A Focused Approach**

Okay, so we've added a `mt7925_stop` function. My expert intuition tells me this is interesting from a fuzzing perspective, especially since it's associated with a bug fix. The fix likely addresses a use-after-free vulnerability or a race condition, stemming from improper handling of delayed work during device shutdown. Given the nature of these bugs, fuzzing is definitely warranted. The device is connected via USB, which is good. We can test it and find the bug.

The enabling config is `MT7925U`. Let me quickly double-check that this is indeed the correct configuration flag. We need to be absolutely sure we're targeting the right driver variant. Assuming it is, `mt7925_stop` is definitely the target function for our fuzzing campaign. This is where the vulnerability most likely resides. I'll need to craft some specific test cases that exercise this function and the related code paths, paying particular attention to timing and resource management issues. Let's see if we can find something.

{
  "Expression": "config MT7925U",
  "PathPrefix": "drivers/net/wireless/mediatek/mt76/mt7925/Kconfig"
}

{
  "Output": "drivers/net/wireless/mediatek/mt76/mt7925/Kconfig=7=config MT7925E\n--\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig-18-\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig:19:config MT7925U\ndrivers/net/wireless/mediatek/mt76/mt7925/Kconfig-20-\ttristate \"MediaTek MT7925U (USB) support\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 5271
							output: 117
							thoughts: 64
						

Okay, here's my take on those thoughts, framed as my own mental processing:

**Analyzing the MT7925U Configuration and Function**

Alright, yep, confirmed. The `MT7925U` configuration is the right one for this situation, no question. I've got that locked down. Moving on, I'm reminding myself that `mt7925_stop` is that crucial mac80211 callback, specifically the one designated for the `.stop` operation. Good, good. Given my understanding of the system, it's definitely reachable in the code and should be functioning as intended. Now that I have ascertained those things, I can go ahead and set the results accordingly.

{
  "EnableConfigs": [
    "MT7925U"
  ],
  "FocusSymbols": [
    "mt7925_stop"
  ],
  "Reasoning": "The patch adds a new `mt7925_stop` function to the mt7925 Mediatek wireless driver, which cancels a delayed work before stopping the device. This is reachable via the USB interface of the driver (`MT7925U`) and fixes a potential race condition or use-after-free.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "MT7925U"
  ],
  "FocusSymbols": [
    "mt7925_stop"
  ],
  "Reasoning": "The patch adds a new `mt7925_stop` function to the mt7925 Mediatek wireless driver, which cancels a delayed work before stopping the device. This is reachable via the USB interface of the driver (`MT7925U`) and fixes a potential race condition or use-after-free.",
  "WorthFuzzing": true
}