Linux Kernel Reference Count Leak Vulnerability in DRM Scheduler

A reference count leak vulnerability has been identified in the Linux kernel's Direct Rendering Manager (DRM) scheduler. This issue occurs when an entity is being terminated, and the process of adding a cleanup callback fails, leading to a leak of the last_scheduled fence. The vulnerability has been addressed by ensuring that the reference count is properly decremented when the callback addition fails, maintaining the correct balance.

Impact

Exploitation of this vulnerability could lead to a reference count leak, potentially causing memory management issues.