From fccb908d23fbae3e941e9294590dd94de6b1d822 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Sebastian=20P=C3=B6hn?= <sebastian.poehn@gmail.com>
Date: Mon, 20 Apr 2015 09:19:20 +0200
Subject: [PATCH] ip_forward: Drop frames with attached skb->sk

[ Upstream commit 2ab957492d13bb819400ac29ae55911d50a82a13 ]

Initial discussion was:
[FYI] xfrm: Don't lookup sk_policy for timewait sockets

Forwarded frames should not have a socket attached. Especially
tw sockets will lead to panics later-on in the stack.

This was observed with TPROXY assigning a tw socket and broken
policy routing (misconfigured). As a result frame enters
forwarding path instead of input. We cannot solve this in
TPROXY as it cannot know that policy routing is broken.

v2:
Remove useless comment

Signed-off-by: Sebastian Poehn <sebastian.poehn@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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Reading git-format-patch failed