linux-kernel - [PATCH 3.13 020/149] ip_tunnel:multicast process cause panic due to skb->_skb

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Message-Id: <20140321000437.646612940@linuxfoundation.org>
Date:	Thu, 20 Mar 2014 17:03:03 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Xin Long <lucien.xin@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.13 020/149] ip_tunnel:multicast process cause panic due to skb->_skb_refdst NULL pointer

3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xin Long <lucien.xin@...il.com>

[ Upstream commit 10ddceb22bab11dab10ba645c7df2e4a8e7a5db5 ]

when ip_tunnel process multicast packets, it may check if the packet is looped
back packet though 'rt_is_output_route(skb_rtable(skb))' in ip_tunnel_rcv(),
but before that , skb->_skb_refdst has been dropped in iptunnel_pull_header(),
so which leads to a panic.

fix the bug: https://bugzilla.kernel.org/show_bug.cgi?id=70681

Signed-off-by: Xin Long <lucien.xin@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/ip_tunnel_core.c |    1 -
 1 file changed, 1 deletion(-)

--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -109,7 +109,6 @@ int iptunnel_pull_header(struct sk_buff
 	secpath_reset(skb);
 	if (!skb->l4_rxhash)
 		skb->rxhash = 0;
-	skb_dst_drop(skb);
 	skb->vlan_tci = 0;
 	skb_set_queue_mapping(skb, 0);
 	skb->pkt_type = PACKET_HOST;


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