From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sun, 4 Dec 2011 08:51:08 +0000 (+0000)
Subject: tcp: fix tcp_trim_head()
X-Git-Tag: v3.2.17~94
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91bb95f240936feb98f7d540027c78773e4b84cb;p=pandora-kernel.git

tcp: fix tcp_trim_head()

[ 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.

Thanks to Vijay for providing a very detailed explanation.

Reported-by: Vijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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