mirror of
https://github.com/torvalds/linux.git
synced 2026-01-25 15:03:52 +08:00
337369f8ce
Scenario: In platform_device_register, the driver misuses struct device as platform_data, making kmemdup duplicate a device. Accessing the duplicate may cause list corruption due to its mutex magic or list holding old content. It recurs randomly as the first mutex - getting process skips the slow path and mutex check. Adding MUTEX_WARN_ON(lock->magic!= lock) in __mutex_trylock_fast() makes it always happen. Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20250126033243.53069-1-cuiyunhui@bytedance.com