From: Eric Dumazet <edumazet@google.com>
Date: Fri, 13 Feb 2015 12:47:12 +0000 (-0800)
Subject: tcp: make sure skb is not shared before using skb_get()
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~52^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba34e6d9d346fe4e05d7e417b9edf5140772d34c;p=pandora-kernel.git

tcp: make sure skb is not shared before using skb_get()

IPv6 can keep a copy of SYN message using skb_get() in
tcp_v6_conn_request() so that caller wont free the skb when calling
kfree_skb() later.

Therefore TCP fast open has to clone the skb it is queuing in
child->sk_receive_queue, as all skbs consumed from receive_queue are
freed using __kfree_skb() (ie assuming skb->users == 1)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Fixes: 5b7ed0892f2af ("tcp: move fastopen functions to tcp_fastopen.c")
Signed-off-by: David S. Miller <davem@davemloft.net>
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