From 43a3542870328601be02fcc9d27b09db467336ef Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 30 Nov 2017 10:08:28 +0100 Subject: [PATCH] ALSA: seq: Remove spurious WARN_ON() at timer check The use of snd_BUG_ON() in ALSA sequencer timer may lead to a spurious WARN_ON() when a slave timer is deployed as its backend and a corresponding master timer stops meanwhile. The symptom was triggered by syzkaller spontaneously. Since the NULL timer is valid there, rip off snd_BUG_ON(). Reported-by: syzbot Cc: Signed-off-by: Takashi Iwai --- sound/core/seq/seq_timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/core/seq/seq_timer.c b/sound/core/seq/seq_timer.c index 37d9cfbc29f9c8..b80985fbc334cc 100644 --- a/sound/core/seq/seq_timer.c +++ b/sound/core/seq/seq_timer.c @@ -355,7 +355,7 @@ static int initialize_timer(struct snd_seq_timer *tmr) unsigned long freq; t = tmr->timeri->timer; - if (snd_BUG_ON(!t)) + if (!t) return -EINVAL; freq = tmr->preferred_resolution;