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| author | Takashi Iwai <tiwai@suse.de> | 2016-07-04 14:02:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-07-27 08:42:22 -0700 |
| commit | 1c390f3dd65d471b60750168613f5b2e8e0779ab (patch) | |
| tree | bfa27cc061ec26931663dae75db5abdba2ffb230 /sound/oss/sound_calls.h | |
| parent | b4095aacd5b02a6a2b9bf5bb913f9aede4833161 (diff) | |
| download | linux-stable-1c390f3dd65d471b60750168613f5b2e8e0779ab.tar.gz linux-stable-1c390f3dd65d471b60750168613f5b2e8e0779ab.tar.bz2 linux-stable-1c390f3dd65d471b60750168613f5b2e8e0779ab.zip | |
ALSA: timer: Fix negative queue usage by racy accesses
commit 3fa6993fef634e05d200d141a85df0b044572364 upstream.
The user timer tu->qused counter may go to a negative value when
multiple concurrent reads are performed since both the check and the
decrement of tu->qused are done in two individual locked contexts.
This results in bogus read outs, and the endless loop in the
user-space side.
The fix is to move the decrement of the tu->qused counter into the
same spinlock context as the zero-check of the counter.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/oss/sound_calls.h')
0 files changed, 0 insertions, 0 deletions