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

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Date:   Wed, 16 Aug 2017 13:16:39 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Eric Dumazet <eric.dumazet@...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, Aug 16, 2017 at 12:37 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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

Yes this is correct.