bridge: provide a mtu() method for fake_dst_ops
Commit 618f9bc7 (net: Move mtu handling down to the protocol depended handlers) forgot the bridge netfilter case, adding a NULL dereference in ip_fragment(). Reported-by: NChris Boot <bootc@bootc.net> CC: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> Acked-by: NSteffen Klassert <steffen.klassert@secunet.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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