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[ Upstream commit40c3ff6d5e] Packet sockets may call dev_header_parse with NULL daddr. Make lowpan_header_ops.create fail. Fixes:87a93e4ece("ieee802154: change needed headroom/tailroom") Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>