xfrm: validate attributes

Some XFRM attributes were not going through basic validation.
Signed-off-by: NJamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/xfrm/xfrm_user.c

@@ -2054,6 +2054,10 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
 #undef XMSGSIZE
 
 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
+	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
+	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
+	[XFRMA_LASTUSED]	= { .type = NLA_U64},
+	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
 	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
 	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
 	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },