CVE-2026-97900drm/drm_exec: fix up contended obj when num_objects is 0

Official description

In the Linux kernel, the following vulnerability has been resolved: drm/drm_exec: fix up contended obj when num_objects is 0 drm_exec_prepare_array() silently returns success without calling drm_exec_lock_contended() when num_objects is zero. This breaks the invariant upheld by drm_exec_lock_obj(), where every entry point into the locking sequence must first attempt to lock any previously contended object before proceeding. Drivers that chain multiple drm_exec_prepare_array() calls per drm_exec_until_all_locked() iteration (e.g. amdgpu's userq signal/wait ioctls, which prepare separate read and write BO arrays) can pass an empty array for one of the two calls. If contention is hit while preparing the non-empty array, exec->contended is set and the loop retries; on retry, the empty-array call preceding it is a no-op that never clears exec->contended, so drm_exec_retry_on_contention() immediately jumps back to the top of the loop without ever reaching the call that would resolve the contention. This spins forever. Fix it by having drm_exec_prepare_array() call drm_exec_lock_contended() directly when num_objects is zero, so a pending contended object dont loop infinitely.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/506cfed91e50cc8055799480a2fde5a18f63a21c
• https://git.kernel.org/stable/c/831cd124ce99c3e61266bed30519d52f7c26abed
• https://git.kernel.org/stable/c/f3e74866018dab793ebee1fdf0ef34f7271d1f8c
• https://git.kernel.org/stable/c/a565022c02f218ec9789c2baf4690792e7a48cbb
• https://git.kernel.org/stable/c/159720704d9d652b64390c11fb971e15b0a78d23