From: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Date: Thu, 23 Jan 2014 06:00:25 +0000 (+0800)
Subject: ip_tunnel: clear IPCB in ip_tunnel_xmit() in case dst_link_failure() is called
X-Git-Tag: v3.10.29~23
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b5ac52437d8e34ea8032cfa77d6e6aa4b161aeb5;p=platform%2Fkernel%2Flinux-stable.git

ip_tunnel: clear IPCB in ip_tunnel_xmit() in case dst_link_failure() is called

[ Upstream commit 11c21a307d79ea5f6b6fc0d3dfdeda271e5e65f6 ]

commit a622260254ee48("ip_tunnel: fix kernel panic with icmp_dest_unreach")
clear IPCB in ip_tunnel_xmit()  , or else skb->cb[] may contain garbage from
GSO segmentation layer.

But commit 0e6fbc5b6c621("ip_tunnels: extend iptunnel_xmit()") refactor codes,
and it clear IPCB behind the dst_link_failure().

So clear IPCB in ip_tunnel_xmit() just like commti a622260254ee48("ip_tunnel:
fix kernel panic with icmp_dest_unreach").

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 46dcf32..fa65732 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -636,6 +636,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
 				tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
 			tunnel->err_count--;
 
+			memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 			dst_link_failure(skb);
 		} else
 			tunnel->err_count = 0;