5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kuan-Wei Chiu commit 25c7e242aca084fdc1098248194032317dca625d upstream. In of_icc_get_by_index() and icc_get(), if the dynamic allocation for path->name fails via kasprintf(), the error handling path directly calls kfree(path) to free the path object and returns an error. However, prior to this point, path_find() calls path_init(), which already links the path's requests into the req_list of the respective interconnect nodes via hlist_add_head(). Directly invoking kfree(path) leaves dangling pointers in the hlist. A subsequent call to icc_get() or icc_set_bw() will traverse or modify these corrupted lists, triggering a slab use afterfree. KASAN report showing the vulnerability when reproducing via debugfs: BUG: KASAN: slab-use-after-free in path_find+0x6f8/0xcfc Write of size 8 at addr fff000000d43f748 by task sh/1 ... Call trace: kasan_report+0xac/0xfc path_find+0x6f8/0xcfc icc_get+0x148/0x380 icc_get_set+0xf8/0x2d0 ... Freed by task 1: kfree+0x1a0/0x4a4 icc_get+0x2cc/0x380 icc_get_set+0xf8/0x2d0 Fix this by replacing kfree(path) with the proper teardown function, icc_put(path), which safely removes the requests from the req_list using hlist_del() and drops the provider usage references before freeing the memory. Additionally, in icc_get(), ensure that the icc_lock mutex is released prior to calling icc_put(path) to avoid a deadlock, as icc_put() internally acquires the same lock. Fixes: 3791163602f7 ("interconnect: Handle memory allocation errors") Cc: stable@vger.kernel.org Signed-off-by: Kuan-Wei Chiu Link: https://patch.msgid.link/20260416190840.1753468-1-visitorckw@gmail.com Signed-off-by: Georgi Djakov Signed-off-by: Greg Kroah-Hartman --- drivers/interconnect/core.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -507,7 +507,7 @@ struct icc_path *of_icc_get_by_index(str path->name = kasprintf(GFP_KERNEL, "%s-%s", src_data->node->name, dst_data->node->name); if (!path->name) { - kfree(path); + icc_put(path); path = ERR_PTR(-ENOMEM); } @@ -747,8 +747,9 @@ struct icc_path *icc_get(struct device * path->name = kasprintf(GFP_KERNEL, "%s-%s", src->name, dst->name); if (!path->name) { - kfree(path); - path = ERR_PTR(-ENOMEM); + mutex_unlock(&icc_lock); + icc_put(path); + return ERR_PTR(-ENOMEM); } out: mutex_unlock(&icc_lock);