--- rdesktop-1.8.4/orders.c.old	2019-01-02 14:03:25.000000000 +0000
+++ rdesktop-1.8.4/orders.c	2019-01-09 17:13:26.170000000 +0000
@@ -1266,7 +1266,7 @@
 	in_uint16_le(s, flags);	/* used by bmpcache2 */
 	in_uint8(s, type);
 
-	if (!s_check_rem(s, length + 7))
+	if (!s_check_rem(s, (sint16) length + 7))
 	{
 		rdp_protocol_error("process_secondary_order(), next order pointer would overrun stream", &packet);
 	}