linux-kernel - Re: general protection fault in snd_ctl

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Message-ID: <s5hv9gw89l9.wl-tiwai@suse.de>
Date:   Wed, 02 Sep 2020 17:46:58 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     maz@...nel.org, alsa-devel@...a-project.org,
        dan.carpenter@...cle.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, o-takashi@...amocchi.jp,
        perex@...ex.cz, syzkaller-bugs@...glegroups.com, tiwai@...e.com
Subject: Re: general protection fault in snd_ctl_release

On Wed, 02 Sep 2020 17:35:30 +0200,
Al Viro wrote:
> 
> On Wed, Sep 02, 2020 at 05:22:00PM +0200, Takashi Iwai wrote:
> 
> > Marc, Al, could you guys check this bug?
> 
> That's racy; the first one should be get_file_rcu() instead of
> file_count()+get_file(), the second is not needed at all (we
> have the file pinned down by the caller).

Yeah, that wasn't meant as a fix, of course :)


> See vfs.git#work.epoll
> for fix

Thanks!  I'll try to run with this fix.


Takashi