media: cx231xx: fix null pointer deref in snd_cx231xx_pcm_close

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Add a null check for the dev pointer after retrieving it from
the substream. Without this, a use-after-free or null pointer
dereference can occur when closing the audio device, causing
a kernel page fault.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=2365068
Signed-off-by: Ashwin Gundarapu <linuxuser509@zohomail.in>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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Ashwin Gundarapu 2026-05-22 21:16:52 +05:30 • committed by Hans Verkuil

parent bedd5ea6b7

commit ab8c3ed895

1 changed files with 5 additions and 0 deletions

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drivers/media/usb/cx231xx/cx231xx-audio.c

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