linux-kernel - Re: KASAN: use-after-free Read in _

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Message-ID: <20171204184307.GU21978@ZenIV.linux.org.uk>
Date:   Mon, 4 Dec 2017 18:43:07 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot 
        <bot+7f44246e4b515a3908f27c3ac65d68c7c6cb4544@...kaller.appspotmail.com>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in __fput

On Mon, Dec 04, 2017 at 07:39:29PM +0100, Dmitry Vyukov wrote:
> On Mon, Dec 4, 2017 at 5:44 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> > On Thu, Nov 02, 2017 at 04:05:01AM -0700, syzbot wrote:
> >> Hello,
> >>
> >> syzkaller hit the following crash on
> >> 3a99df9a3d14cd866b5516f8cba515a3bfd554ab
> >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> >> compiler: gcc (GCC) 7.1.1 20170620
> >> .config is attached
> >> Raw console output is attached.
> >
> > That one is almost certainly double-free in kcm_clone() fixed in
> > https://marc.info/?l=linux-netdev&m=151208776817071&q=raw
> 
> Hi,
> 
> What's the title of that commit? We need the title for syzbot. "fix
> kcm_clone()"? I don't see such commit in net-next.

For a good and simple reason that it's _not_ in net-next yet.