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

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Message-ID: <20171204164452.GT21978@ZenIV.linux.org.uk>
Date:   Mon, 4 Dec 2017 16:44:52 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     syzbot 
        <bot+7f44246e4b515a3908f27c3ac65d68c7c6cb4544@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in __fput

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