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When using CALIPSO with IPPROTO_UDP it is possible to trigger a GPF as the IP header may have moved. Also update the payload length after adding the CALIPSO option. Signed-off-by: Richard Haines <richard_c_haines@btinternet.com> Acked-by: Paul Moore <paul@paul-moore.com> Signed-off-by: Huw Davies <huw@codeweavers.com> Signed-off-by: David S. Miller <davem@davemloft.net>