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

PATCH New lucien 1 participant 1 message Feb 22, 2014

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Networking Network drivers IPv4/IPv6

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2014-02-22 08:43 UTC #0 lore raw

PATCH 1/1 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

net/ipv4/ip_tunnel_core.c +0 -1

index 6156f4e..88b08aa 100644
@@ -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;