In the Linux kernel, the following vulnerability has been resolved:
ALSA: ac97: Fix possible NULL dereference in sndac97mixer
smatch error: sound/pci/ac97/ac97codec.c:2354 sndac97_mixer() error: we previously assumed 'rac97' could be null (see line 2072)
remove redundant assignment, return error if rac97 is NULL.
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