In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Skip finding free audio for unknown engine_id
[WHY] ENGINEIDUNKNOWN = -1 and can not be used as an array index. Plus, it also means it is uninitialized and does not need free audio.
[HOW] Skip and return NULL.
This fixes 2 OVERRUN issues reported by Coverity.