netdev - Re: [PATCH net-2.6] ip: NULL pointer dereferrence in tcp_v(4|6)_send

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Date:	Wed, 01 Oct 2008 01:52:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	den@...nvz.org
Cc:	xemul@...nvz.org, vgusev@...nvz.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6] ip: NULL pointer dereferrence in
 tcp_v(4|6)_send_ack

From: "Denis V. Lunev" <den@...nvz.org>
Date: Tue, 30 Sep 2008 20:29:11 +0400

> The following actions are possible:
> tcp_v4_rcv
>   skb->dev = NULL;
>   tcp_v4_do_rcv
>     tcp_v4_hnd_req
>       tcp_check_req
>         req->rsk_ops->send_ack == tcp_v4_send_ack
> 
> So, skb->dev can be NULL in tcp_v4_send_ack. We must obtain namespace
> from dst entry. IPv6 codepath is similar.
> 
> Thanks to Vitaliy Gusev <vgusev@...nvz.org> for initial oops decoding.
> 
> Signed-off-by: Denis V. Lunev <den@...nvz.org>

Vitaliy sent the same patch first, so I applied his copy :-)

Thanks everyone.
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