mirror of
https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10.git
synced 2026-09-09 00:07:04 +08:00
Jaroslav Kysela
157ad20dd3
JIRA: https://issues.redhat.com/browse/RHEL-183295 commit ccd0db6671d2cae986b2daa1c538b6d541a9d62c Author: Takashi Iwai <tiwai@suse.de> Date: Tue Jun 9 13:50:53 2026 +0200 ALSA: timer: Manage timer object with kref So far we've tried to address UAFs in ALSA timer code by applying the locks at various places, but the fundamental problem is that the timer object may be released while the belonging timer instance objects are still present and accessing to it. This patch is a more proper fix to address that issue, namely, by refcounting and keeping the timer object. The basic implementation is to use kref for the refcount of the timer object, and take/release the reference at assigning/releasing the instance, as well as at referring from ioctls or ALSA sequencer code. The reference from ioctl or ALSA sequencer is abstracted with snd_timeri_timer auto-cleanup. Note that this change assumes that the code already took the fix commit da3039e91d1f ("ALSA: timer: Forcibly close timer instances at closing"); otherwise the refcount may be unbalanced when the timer is freed while slave instances are still present. Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://patch.msgid.link/20260609115100.806869-2-tiwai@suse.de Signed-off-by: Jaroslav Kysela <jkysela@redhat.com>
Linux kernel
============
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In order to build the documentation, use ``make htmldocs`` or
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Please read the Documentation/process/changes.rst file, as it contains the
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