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authorWillem de Bruijn <willemb@google.com>2017-02-07 15:57:21 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-08 13:56:37 -0500
commit57031eb794906eea4e1c7b31dc1e2429c0af0c66 (patch)
treeffe0e21da8d4ae2b435561434cc391970196e42b /net/openvswitch
parent217e6fa24ce28ec87fca8da93c9016cb78028612 (diff)
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packet: round up linear to header len
Link layer protocols may unconditionally pull headers, as Ethernet does in eth_type_trans. Ensure that the entire link layer header always lies in the skb linear segment. tpacket_snd has such a check. Extend this to packet_snd. Variable length link layer headers complicate the computation somewhat. Here skb->len may be smaller than dev->hard_header_len. Round up the linear length to be at least as long as the smallest of the two. Reported-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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