diff options
| author | Takashi Iwai <tiwai@suse.de> | 2016-01-30 23:30:25 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-02-15 17:07:53 +0100 |
| commit | 33d988fdc62ec7bcabc3c201a562904151299eb3 (patch) | |
| tree | 7a8eada0b2692aba1620650861874ce8b6df2edb /sound/spi | |
| parent | 1b869719fe73988853abbc6d54d24c39d0f04131 (diff) | |
ALSA: seq: Fix yet another races among ALSA timer accesses
commit 2cdc7b636d55cbcf42e1e6c8accd85e62d3e9ae8 upstream.
ALSA sequencer may open/close and control ALSA timer instance
dynamically either via sequencer events or direct ioctls. These are
done mostly asynchronously, and it may call still some timer action
like snd_timer_start() while another is calling snd_timer_close().
Since the instance gets removed by snd_timer_close(), it may lead to
a use-after-free.
This patch tries to address such a race by protecting each
snd_timer_*() call via the existing spinlock and also by avoiding the
access to timer during close call.
BugLink: http://lkml.kernel.org/r/CACT4Y+Z6RzW5MBr-HUdV-8zwg71WQfKTdPpYGvOeS7v4cyurNQ@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'sound/spi')
0 files changed, 0 insertions, 0 deletions