netdev - Re: [PATCH net] ipv6: fix NULL dereference in ip6_route_dev

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Message-ID: <1502912256.4936.150.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 16 Aug 2017 12:37:36 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] ipv6: fix NULL dereference in ip6_route_dev_notify()

On Wed, 2017-08-16 at 12:15 -0700, Eric Dumazet wrote:
> On Wed, 2017-08-16 at 11:50 -0700, Cong Wang wrote:
> > On Tue, Aug 15, 2017 at 4:09 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > > From: Eric Dumazet <edumazet@...gle.com>
> > >
> > > Based on a syzkaller report [1], I found that a per cpu allocation
> > > failure in snmp6_alloc_dev() would then lead to NULL dereference in
> > > ip6_route_dev_notify().
> > >
> > > It seems this is a very old bug, thus no Fixes tag in this submission.
> > 
> > 
> > It should be introduced by my commit which introduces these
> > in6_dev_put().
> > 
> 
> Sorry, which commit exactly ?
> 
> I got the issue on 4.3 up to latest 4.12

Oh you're right, this was because I had backported
242d3a49a2a1a71d8eb9f953db1bcaa9d698ce00 into my trees a while back...

So the bug was only added in 4.12