[AX25]: Use size_t for size in {send,recv}msg.

net/ax25/af_ax25.c

@@ -1401,7 +1401,7 @@ static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
 }
 
 static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock,
-			struct msghdr *msg, int len)
+			struct msghdr *msg, size_t len)
 {
 	struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
 	struct sock *sk = sock->sk;
@@ -1410,7 +1410,8 @@ static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock,
 	ax25_digi dtmp, *dp;
 	unsigned char *asmptr;
 	ax25_cb *ax25;
-	int lv, size, err, addr_len = msg->msg_namelen;
+	size_t size;
+	int lv, err, addr_len = msg->msg_namelen;
 
 	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR)) {
 		return -EINVAL;
@@ -1435,6 +1436,11 @@ static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock,
 		goto out;
 	}
 
+	if (len > ax25->ax25_dev->dev->mtu) {
+		err = -EMSGSIZE;
+		goto out;
+	}
+		
 	if (usax != NULL) {
 		if (usax->sax25_family != AF_AX25) {
 			err = -EINVAL;
@@ -1580,7 +1586,7 @@ static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock,
 }
 
 static int ax25_recvmsg(struct kiocb *iocb, struct socket *sock,
-	struct msghdr *msg, int size, int flags)
+	struct msghdr *msg, size_t size, int flags)
 {
 	struct sock *sk = sock->sk;
 	struct sk_buff *skb;