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    Subject[PATCH 4.8 05/49] ip6_tunnel: Clear IP6CB in ip6tunnel_xmit()
    4.8-stable review patch.  If anyone has any objections, please let me know.


    From: Eli Cooper <>

    [ Upstream commit 23f4ffedb7d751c7e298732ba91ca75d224bc1a6 ]

    skb->cb may contain data from previous layers. In the observed scenario,
    the garbage data were misinterpreted as IP6CB(skb)->frag_max_size, so
    that small packets sent through the tunnel are mistakenly fragmented.

    This patch unconditionally clears the control buffer in ip6tunnel_xmit(),
    which affects ip6_tunnel, ip6_udp_tunnel and ip6_gre. Currently none of
    these tunnels set IP6CB(skb)->flags, otherwise it needs to be done earlier.

    Signed-off-by: Eli Cooper <>
    Signed-off-by: David S. Miller <>
    Signed-off-by: Greg Kroah-Hartman <>
    include/net/ip6_tunnel.h | 1 +
    1 file changed, 1 insertion(+)

    --- a/include/net/ip6_tunnel.h
    +++ b/include/net/ip6_tunnel.h
    @@ -145,6 +145,7 @@ static inline void ip6tunnel_xmit(struct
    int pkt_len, err;

    + memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
    pkt_len = skb->len - skb_inner_network_offset(skb);
    err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
    if (unlikely(net_xmit_eval(err)))

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