linux-kernel - Re: [ 074/167] [PATCH 14/26] tcp: fix tcp_trim

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Date:	Thu, 10 May 2012 23:07:37 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ben@...adent.org.uk
Cc:	jrnieder@...il.com, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	eric.dumazet@...il.com, subramanian.vijay@...il.com
Subject: Re: [ 074/167] [PATCH 14/26] tcp: fix tcp_trim_head()

From: Ben Hutchings <ben@...adent.org.uk>
Date: Fri, 11 May 2012 04:00:15 +0100

> On Wed, 2012-05-09 at 03:16 -0500, Jonathan Nieder wrote:
>> Ben Hutchings wrote:
>> 
>> > 3.2-stable review patch.  If anyone has any objections, please let me know.
>> [...]
>> > [ Upstream commit 4fa48bf3c75069d636fc8830743c929a062e80dc ]
>> >
>> > commit f07d960df3 (tcp: avoid frag allocation for small frames)
>> > breaked assumption in tcp stack that skb is either linear (skb->data_len
>> > == 0), or fully fragged (skb->data_len == skb->len)
>> >
>> > tcp_trim_head() made this assumption, we must fix it.
>> 
>> Is this needed in the context of 3.2.y (which does not include
>> f07d960df3)?
> [...]
> 
> The code being replaced really didn't make sense, but unless there is
> some other case that breaks the assumption described then I don't think
> this meets the stable rules.  David?

It's a prerequisite for cleanly applying the patch that comes right
afterwards.
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