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

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Date:   Thu, 12 Jan 2017 15:41:43 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     shannon.nelson@...cle.com
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

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.