CVE-2025-37930

In the Linux kernel, the following vulnerability has been resolved:

drm/nouveau: Fix WARNON in nouveaufencecontextkill()

Nouveau is mostly designed in a way that it's expected that fences only ever get signaled through nouveaufencesignal(). However, in at least one other place, nouveaufencedone(), can signal fences, too. If that happens (race) a signaled fence remains in the pending list for a while, until it gets removed by nouveaufenceupdate().

Should nouveaufencecontext_kill() run in the meantime, this would be a bug because the function would attempt to set an error code on an already signaled fence.

Have nouveaufencecontext_kill() check for a fence being signaled.