drm/scheduler: signal scheduled fence when kill job

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/scheduler: signal scheduled fence when kill job When an entity from application B is killed, drm_sched_entity_kill() removes all jobs belonging to that entity through drm_sched_entity_kill_jobs_work(). If application A's job depends on a scheduled fence from application B's job, and that fence is not properly signaled during the killing process, application A's dependency cannot be cleared. This leads to application A hanging indefinitely while waiting for a dependency that will never be resolved. Fix this issue by ensuring that scheduled fences are properly signaled when an entity is killed, allowing dependent applications to continue execution.

References

• https://git.kernel.org/stable/c/8342127a8a65b0673863b106ce32b79c91ae3270
• https://git.kernel.org/stable/c/c5734f9bab6f0d40577ad0633af4090a5fda2407
• https://git.kernel.org/stable/c/aefd0a935625165a6ca36d0258d2d053901555df
• https://git.kernel.org/stable/c/aa382a8b6ed483e9812d0e63b6d1bdcba0186f29
• https://git.kernel.org/stable/c/471db2c2d4f80ee94225a1ef246e4f5011733e50