linux-kernel - Re: KASAN: use-after-free Write in __xfrm_policy

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Message-ID: <20181226104221.pojiahsinsspkkxf@breakpoint.cc>
Date:   Wed, 26 Dec 2018 11:42:21 +0100
From:   Florian Westphal <fw@...len.de>
To:     syzbot <syzbot+9d971dd21eb26567036b@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, herbert@...dor.apana.org.au,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        steffen.klassert@...unet.com, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Write in __xfrm_policy_unlink

syzbot <syzbot+9d971dd21eb26567036b@...kaller.appspotmail.com> wrote:
> syzbot has found a reproducer for the following crash on:
> 
> HEAD commit:    ce28bb445388 Merge git://git.kernel.org/pub/scm/linux/kern..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1673fb1b400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=67a2081147a23142
> dashboard link: https://syzkaller.appspot.com/bug?extid=9d971dd21eb26567036b
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1134dcc7400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=126986ed400000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+9d971dd21eb26567036b@...kaller.appspotmail.com

I've fixed this one.  Chances are that at least some of the other
reports are duplicates of this one.

I will continue to look at other reports over the next few days and plan
to send out fixes and test cases next week.