From: Takashi Iwai Date: Wed, 2 Jun 2021 11:38:23 +0000 (+0200) Subject: ALSA: timer: Fix master timer notification X-Git-Tag: v4.4.272~9 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=400d3eff06ea7e2f37c7e1d08420613541e7bacb;p=thirdparty%2Fkernel%2Fstable.git ALSA: timer: Fix master timer notification commit 9c1fe96bded935369f8340c2ac2e9e189f697d5d upstream. snd_timer_notify1() calls the notification to each slave for a master event, but it passes a wrong event number. It should be +10 offset, corresponding to SNDRV_TIMER_EVENT_MXXX, but it's incorrectly with +100 offset. Casually this was spotted by UBSAN check via syzkaller. Reported-by: syzbot+d102fa5b35335a7e544e@syzkaller.appspotmail.com Reviewed-by: Jaroslav Kysela Cc: Link: https://lore.kernel.org/r/000000000000e5560e05c3bd1d63@google.com Link: https://lore.kernel.org/r/20210602113823.23777-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- diff --git a/sound/core/timer.c b/sound/core/timer.c index f989adb98a229..7e4509de01c47 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -432,9 +432,10 @@ static void snd_timer_notify1(struct snd_timer_instance *ti, int event) return; if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) return; + event += 10; /* convert to SNDRV_TIMER_EVENT_MXXX */ list_for_each_entry(ts, &ti->slave_active_head, active_list) if (ts->ccallback) - ts->ccallback(ts, event + 100, &tstamp, resolution); + ts->ccallback(ts, event, &tstamp, resolution); } /* start/continue a master timer */