--- pr3287-3.3/telnet.c
+++ pr3287-3.3/telnet.c
@@ -308,8 +308,13 @@
 	       cstate != CONNECTED_3270 &&	/* TN3270 */
 	       cstate != NOT_CONNECTED) {	/* gave up */
 
-		if (net_input(s) < 0)
+		if (net_input(s) < 0) {
+			Free(netrbuf);
+			Free(ibuf);
+			netrbuf = NULL;
+			ibuf = NULL;
 			return -1;
+		}
 	}
 
 	/* Success. */