linux-kernel - Re: [PATCH] tcp: fix tcp_fastopen unaligned access complaints on sparc

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Date:   Thu, 12 Jan 2017 12:56:08 -0800
From:   Shannon Nelson <shannon.nelson@...cle.com>
To:     David Miller <davem@...emloft.net>
Cc:     eric.dumazet@...il.com, rob.gardner@...cle.com,
        netdev@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tcp: fix tcp_fastopen unaligned access complaints on
 sparc



On 1/12/2017 12:41 PM, David Miller wrote:
> From: Shannon Nelson <shannon.nelson@...cle.com>
> Date: Thu, 12 Jan 2017 12:30:38 -0800
>
>> On 1/12/2017 12:25 PM, Eric Dumazet wrote:
>>> On Thu, 2017-01-12 at 13:15 -0700, Rob Gardner wrote:
>>>
>>>>
>>>> I suspect that someplace, somebody is casting val to an int * or
>>>> something like that.
>>>
>>> Then that would be the bug. Can we root cause this please ?
>>>
>>>
>>
>> Look in net/ipv4/tcp_fastopen.c:tcp_fastopen_cookie_gen() for the line
>>
>> 	 struct in6_addr *buf = (struct in6_addr *) tmp.val;
>
> Oh yeah, that's it.  I didn't notice that at all.
>

It looked to me like swapping the data fields would be the easiest and 
least impactive way to fix this.  I didn't want to mess with the logic. 
I'm certainly open to other suggestions.

sln