linux-kernel - Re: [syzbot] [sound?] possible deadlock in _snd_pcm_stream_lock

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Message-ID: <tencent_9E7A866D382C796FF8943CE8A6ED26CF1C0A@qq.com>
Date: Thu, 21 Mar 2024 09:37:06 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+d832e7bb0f8bf47217f1@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [sound?] possible deadlock in _snd_pcm_stream_lock_irqsave (4)

please test dl in _snd_pcm_stream_lock_irqsave

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe46a7dd189e

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 15b07d09c4b7..c501faa30040 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -409,7 +409,7 @@ static void snd_timer_close_locked(struct snd_timer_instance *timeri,
 	struct snd_timer *timer = timeri->timer;
 
 	if (timer) {
-		guard(spinlock)(&timer->lock);
+		guard(spinlock_irqsave)(&timer->lock);
 		timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
 	}