xenstore: check socket path length before copying it

Coverity-ID: 1055997
Signed-off-by: Matthew Daley <mattjd@gmail.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/xenstore/xs.c

@@ -196,6 +196,10 @@ static int get_socket(const char *connect_to)
 		goto error;
 
 	addr.sun_family = AF_UNIX;
+	if(strlen(connect_to) >= sizeof(addr.sun_path)) {
+		errno = EINVAL;
+		goto error;
+	}
 	strcpy(addr.sun_path, connect_to);
 
 	if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) != 0)