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Commit 10ddceb2 authored by Xin Long's avatar Xin Long Committed by David S. Miller
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ip_tunnel:multicast process cause panic due to skb->_skb_refdst NULL pointer 

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: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3995d265

net/ipv4/ip_tunnel_core.c

+0 −1
Original line number Diff line number Diff line
@@ -108,7 +108,6 @@ int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto) 
	nf_reset(skb);

	secpath_reset(skb);

	skb_clear_hash_if_not_l4(skb);

	skb_dst_drop(skb);

	skb->vlan_tci = 0;

	skb_set_queue_mapping(skb, 0);

	skb->pkt_type = PACKET_HOST;