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

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Message-Id: <20170815.170654.981410365504343461.davem@davemloft.net>
Date:   Tue, 15 Aug 2017 17:06:54 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net] ipv6: fix NULL dereference in
 ip6_route_dev_notify()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 15 Aug 2017 04:09:51 -0700

> 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.
> 
> Let's add in6_dev_put_clear() helper, as we will probably use
> it elsewhere (once available/present in net-next)
 ...
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>

Applied and queued up for -stable, thanks Eric.