ALSA: mixer: oss: Add card disconnect checkpoints

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[ Upstream commit 084d5d4441 ]

ALSA OSS mixer layer calls the kcontrol ops rather individually, and
pending calls might be not always caught at disconnecting the device.

For avoiding the potential UAF scenarios, add sanity checks of the
card disconnection at each entry point of OSS mixer accesses.  The
rwsem is taken just before that check, hence the rest context should
be covered by that properly.

Link: https://patch.msgid.link/20260209121212.171430-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Takashi Iwai 2026-02-09 13:12:11 +01:00 • committed by Sasha Levin

parent 572e427425

commit e6645e6254

1 changed files with 16 additions and 0 deletions

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sound/core/oss/mixer_oss.c

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