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ip_tunnel:multicast process cause panic due to skb->_skb_refdst NULL pointer

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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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2014-03-03 20:18:36 +08:00 • committed by David S. Miller
commit 10ddceb22b
1 changed files with 0 additions and 1 deletions
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net/ipv4/ip_tunnel_core.c
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@ -108,7 +108,6 @@ int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
nf_reset(skb); nf_reset(skb);
secpath_reset(skb); secpath_reset(skb);
skb_clear_hash_if_not_l4(skb); skb_clear_hash_if_not_l4(skb);
skb_dst_drop(skb);
skb->vlan_tci = 0; skb->vlan_tci = 0;
skb_set_queue_mapping(skb, 0); skb_set_queue_mapping(skb, 0);
skb->pkt_type = PACKET_HOST; skb->pkt_type = PACKET_HOST;