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author | Takashi Iwai <tiwai@suse.de> | 2017-06-02 15:03:38 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-14 12:54:21 +0200 |
commit | d96c363ff004fbb42f728b3e4299a71c4e567568 (patch) | |
tree | dc0735c10d6095158de72f467e77b8a1a9f32d3f /Makefile | |
parent | 4489545a1d45d1163f7c6eb83a6c38ee5082d1f5 (diff) | |
download | linux-stable-d96c363ff004fbb42f728b3e4299a71c4e567568.tar.gz linux-stable-d96c363ff004fbb42f728b3e4299a71c4e567568.tar.bz2 linux-stable-d96c363ff004fbb42f728b3e4299a71c4e567568.zip |
ALSA: timer: Fix race between read and ioctl
commit d11662f4f798b50d8c8743f433842c3e40fe3378 upstream.
The read from ALSA timer device, the function snd_timer_user_tread(),
may access to an uninitialized struct snd_timer_user fields when the
read is concurrently performed while the ioctl like
snd_timer_user_tselect() is invoked. We have already fixed the races
among ioctls via a mutex, but we seem to have forgotten the race
between read vs ioctl.
This patch simply applies (more exactly extends the already applied
range of) tu->ioctl_lock in snd_timer_user_tread() for closing the
race window.
Reported-by: Alexander Potapenko <glider@google.com>
Tested-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions