mISDN: Fixing missing validation in base_sock_bind()

commit b8216468 upstream.

Add validation code into mISDN/socket.c
Signed-off-by: Emrah Demir <ed@abdsec.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

drivers/isdn/mISDN/socket.c

@@ -717,6 +717,9 @@ base_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 	if (!maddr || maddr->family != AF_ISDN)
 		return -EINVAL;
 
+	if (addr_len < sizeof(struct sockaddr_mISDN))
+		return -EINVAL;
+
 	lock_sock(sk);
 
 	if (_pms(sk)->dev) {