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Cong noted that we need the same checks introduced by commit76c0ddd8c3("ip6_tunnel: be careful when accessing the inner header") even for ipv4 tunnels. Fixes:c544193214("GRE: Refactor GRE tunneling code.") Suggested-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>