diff options
| author | Takashi Iwai <tiwai@suse.de> | 2016-01-13 21:35:06 +0100 |
|---|---|---|
| committer | Rygebin <kaankulahli@gmail.com> | 2017-06-20 14:28:03 +0000 |
| commit | e619d0279a0c2021a7d636921f36039e4997e773 (patch) | |
| tree | acb2a526a6b941bd98ebd6d89f5e7cb1615146b4 | |
| parent | 2e9b0eaf2a3eea684346ff44473c3f143d3dee88 (diff) | |
ALSA: timer: Fix double unlink of active_list
ALSA timer instance object has a couple of linked lists and they are
unlinked unconditionally at snd_timer_stop(). Meanwhile
snd_timer_interrupt() unlinks it, but it calls list_del() which leaves
the element list itself unchanged. This ends up with unlinking twice,
and it was caught by syzkaller fuzzer.
The fix is to use list_del_init() variant properly there, too.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/core/timer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/core/timer.c b/sound/core/timer.c index 1127a7a1b7c..d43e8651588 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -693,7 +693,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) } else { ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; if (--timer->running) - list_del(&ti->active_list); + list_del_init(&ti->active_list); } if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || (ti->flags & SNDRV_TIMER_IFLG_FAST)) |