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    Subject[PATCH 3.13 020/149] ip_tunnel:multicast process cause panic due to skb->_skb_refdst NULL pointer
    Date
    3.13-stable review patch.  If anyone has any objections, please let me know.

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

    From: Xin Long <lucien.xin@gmail.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@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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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