linux-kernel - Re: [PATCH] ipv4: avoid divide 0 error in tcp_incr

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Date:	Mon, 3 Nov 2014 09:09:27 +0800
From:	chenweilong <chenweilong@...wei.com>
To:	David Miller <davem@...emloft.net>
CC:	<kuznet@....inr.ac.ru>, <jmorris@...ei.org>,
	<yoshfuji@...ux-ipv6.org>, <kaber@...sh.net>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ipv4: avoid divide 0 error in tcp_incr_quickack

Sure,
Thanks

On 2014/11/2 5:06, David Miller wrote:
> From: Chen Weilong <chenweilong@...wei.com>
> Date: Fri, 31 Oct 2014 22:50:47 +0800
> 
>> From: Weilong Chen <chenweilong@...wei.com>
>>
>> We got a problem like this:
>>  [ffff8801c1a05570] machine_kexec at ffffffff81025039
>>  [ffff8801c1a055d0] crash_kexec at ffffffff8109b253
>>  [ffff8801c1a056a0] oops_end at ffffffff81442aed
>>  [ffff8801c1a056d0] die at ffffffff81005603
>>  [ffff8801c1a05700] do_trap at ffffffff81442448
>>  [ffff8801c1a05760] do_divide_error at ffffffff81002c10
>>  [ffff8801c1a05888] tcp_send_dupack at ffffffff81385e44
>>  [ffff8801c1a058c8] tcp_validate_incoming at ffffffff813886b5
>>  [ffff8801c1a05908] tcp_rcv_state_process at ffffffff8138d0b7
>>  [ffff8801c1a05958] tcp_child_process at ffffffff81397255
>>  [ffff8801c1a05988] tcp_v4_do_rcv at ffffffff81395a70
>>  [ffff8801c1a059d8] tcp_v4_rcv at ffffffff81396fc8
>>  [ffff8801c1a05a48] ip_local_deliver_finish at ffffffff813746e9
>>  [ffff8801c1a05a78] ip_local_deliver at ffffffff81374a20
>>  [ffff8801c1a05aa8] ip_rcv_finish at ffffffff81374389
>>  [ffff8801c1a05ad8] ip_rcv at ffffffff81374c78
>> There was a wrong ack packet coming during TCP handshake. The socket's state
>> was TCP_SYN_RECV, its rcv_mss was not initialize yet. So
>> tcp_send_dupack -> tcp_enter_quickack_mode got a divide 0 error.
>> This patch add a state check before tcp_enter_quickack_mode.
>>
>> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
> 
> Can you please resubmit this, properly CC:'ing netdev@...r.kernel.org this
> time?
> 
> Thank you.
> 
> .
> 

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