Merge branch 'smack-for-5.2-b' of https://github.com/cschaufler/next-smack into next-smack

Smack: Fix IPv6 handling of 0 secmark (2019-04-03 14:28:38 -0700)

security/smack/smack_lsm.c

@@ -2806,13 +2806,17 @@ static int smack_socket_socketpair(struct socket *socka,
  *
  * Records the label bound to a port.
  *
- * Returns 0
+ * Returns 0 on success, and error code otherwise
  */
 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
 				int addrlen)
 {
-	if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
+	if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) {
+		if (addrlen < SIN6_LEN_RFC2133 ||
+		    address->sa_family != AF_INET6)
+			return -EINVAL;
 		smk_ipv6_port_label(sock, address);
+	}
 	return 0;
 }
 #endif /* SMACK_IPV6_PORT_LABELING */
@@ -2848,12 +2852,13 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
 
 	switch (sock->sk->sk_family) {
 	case PF_INET:
-		if (addrlen < sizeof(struct sockaddr_in))
+		if (addrlen < sizeof(struct sockaddr_in) ||
+		    sap->sa_family != AF_INET)
 			return -EINVAL;
 		rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
 		break;
 	case PF_INET6:
-		if (addrlen < sizeof(struct sockaddr_in6))
+		if (addrlen < SIN6_LEN_RFC2133 || sap->sa_family != AF_INET6)
 			return -EINVAL;
 #ifdef SMACK_IPV6_SECMARK_LABELING
 		rsp = smack_ipv6host_label(sip);
@@ -3683,9 +3688,15 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
 
 	switch (sock->sk->sk_family) {
 	case AF_INET:
+		if (msg->msg_namelen < sizeof(struct sockaddr_in) ||
+		    sip->sin_family != AF_INET)
+			return -EINVAL;
 		rc = smack_netlabel_send(sock->sk, sip);
 		break;
 	case AF_INET6:
+		if (msg->msg_namelen < SIN6_LEN_RFC2133 ||
+		    sap->sin6_family != AF_INET6)
+			return -EINVAL;
 #ifdef SMACK_IPV6_SECMARK_LABELING
 		rsp = smack_ipv6host_label(sap);
 		if (rsp != NULL)