Searched hist:"9 d4d207d" (Results 1 – 1 of 1) sorted by relevance
| /openbmc/linux/sound/core/ |
| H A D | timer.c | 9d4d207d Wed May 16 16:52:42 CDT 2018 Takashi Iwai <tiwai@suse.de> ALSA: timer: Assure timer resolution access always locked
There are still many places calling the timer's hw.c_resolution
callback without lock, and this may lead to some races, as we faced in
the commit a820ccbe21e8 ("ALSA: pcm: Fix UAF at PCM release via PCM
timer access").
This patch changes snd_timer_resolution() to take the timer->lock for
avoiding the races. A place calling this function already inside the
lock (from the notifier) is replaced with the
snd_timer_hw_resolution() accordingly, as well as wrapping with the
lock around another place calling snd_timer_hw_resolution(), too.
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
9d4d207d Wed May 16 16:52:42 CDT 2018 Takashi Iwai <tiwai@suse.de> ALSA: timer: Assure timer resolution access always locked
There are still many places calling the timer's hw.c_resolution
callback without lock, and this may lead to some races, as we faced in
the commit a820ccbe21e8 ("ALSA: pcm: Fix UAF at PCM release via PCM
timer access").
This patch changes snd_timer_resolution() to take the timer->lock for
avoiding the races. A place calling this function already inside the
lock (from the notifier) is replaced with the
snd_timer_hw_resolution() accordingly, as well as wrapping with the
lock around another place calling snd_timer_hw_resolution(), too.
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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