linux-kernel - Re: sound: use-after-free in snd_timer

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Message-ID: <s5htwmbt3fl.wl-tiwai@suse.de>
Date:	Mon, 18 Jan 2016 14:36:30 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	alsa-devel@...a-project.org, Jie Yang <yang.jie@...el.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: sound: use-after-free in snd_timer_interrupt

On Mon, 18 Jan 2016 14:30:13 +0100,
Dmitry Vyukov wrote:
> 
> On Mon, Jan 18, 2016 at 2:06 PM, Takashi Iwai <tiwai@...e.de> wrote:
> >> No, unfortunately the hang still happens with the patch:
> >
> > Thanks for testing.  I think I understood the problem.  We faced a
> > similar issue and moved hrtimer_cancel() in the past.  But this wasn't
> > enough, as the start function may be called also in interrupt, too.
> >
> > How about the one below instead?
> 
> 
> Yes, this fixes the hang. Thanks!
> 
> Tested-by: Dmitry Vyukov <dvyukov@...gle.com>

Great, I'll queue the fix.
Thanks for patient testing!


Takashi