netdev - Re: [PATCH net-next 1/1] ipv6: tcp: fix potential NULL deref in tcp_v6_send

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Message-Id: <20190609.194239.1479697558753282281.davem@davemloft.net>
Date:   Sun, 09 Jun 2019 19:42:39 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net-next 1/1] ipv6: tcp: fix potential NULL deref in
 tcp_v6_send_reset()

From: Eric Dumazet <edumazet@...gle.com>
Date: Fri,  7 Jun 2019 12:23:48 -0700

> syzbot found a crash in tcp_v6_send_reset() caused by my latest
> change.
> 
> Problem is that if an skb has been queued to socket prequeue,
> skb_dst(skb)->dev can not anymore point to the device.
> 
> Fortunately in this case the socket pointer is not NULL.
> 
> A similar issue has been fixed in commit 0f85feae6b71 ("tcp: fix
> more NULL deref after prequeue changes"), I should have known better.
> 
> Fixes: 323a53c41292 ("ipv6: tcp: enable flowlabel reflection in some RST packets")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>

Applied.