• Eli Cooper's avatar
    ip6_tunnel: Clear IP6CB in ip6tunnel_xmit() · 23f4ffed
    Eli Cooper authored
    
    
    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.
    
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarEli Cooper <elicooper@gmx.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    23f4ffed
ip6_tunnel.h 4.65 KB