linux-kernel - Re: [PATCH] Fix kernel panic when calling tcp_v(4/6)_md5_do

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Date:	Wed, 06 Aug 2008 22:44:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	guijianfeng@...fujitsu.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix kernel panic when calling tcp_v(4/6)_md5_do_lookup

From: Gui Jianfeng <guijianfeng@...fujitsu.com>
Date: Thu, 07 Aug 2008 13:12:57 +0800

> If the following packet flow happen, kernel will panic.
> MathineA			MathineB
> 		SYN
> 	---------------------->    
>         	SYN+ACK
> 	<----------------------
> 		ACK(bad seq)
> 	---------------------->
> When a bad seq ACK is received, tcp_v4_md5_do_lookup(skb->sk, ip_hdr(skb)->daddr))
> is finally called by tcp_v4_reqsk_send_ack(), but the first parameter(skb->sk) is 
> NULL at that moment, so kernel panic happens.
> This patch fixes this bug.
> 
> Below is the OOPS output:
 ...
> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>

Applied, thanks.
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