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Message-Id: <20140414.133417.308357592624654107.davem@davemloft.net>
Date: Mon, 14 Apr 2014 13:34:17 -0400 (EDT)
From: David Miller <davem@...emloft.net>
To: eric.dumazet@...il.com
Cc: nasa4836@...il.com, jchapman@...alix.com, edumazet@...gle.com,
joe@...ches.com, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [BUG] A panic caused by null pointer dereference aftering
updating to
From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 14 Apr 2014 10:12:29 -0700
> Hmm, it seems commit 31c70d5956fc l2tp: keep original skb ownership
> is the problem.
>
> ip_queue_xmit() assumes the socket attached to skb is an inet socket.
This is similar to the "send over AF_PACKET" issue we were discussing
the other week.
It seems we need a real resolution to this issue.
To recap:
1) We want to charge memory to the top-level socket.
2) However during encapsulations etc. we can end up in IP stack
which expects only IP sockets to be attached to skb->sk
I suspect that in the short term we may have to bit the bullet and
compromise #2, and do flow control via the tunnel's socket.
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