Handle bindto error

Closes GH-5903.

Author: twose

ext/standard/tests/network/bindto.phpt

@@ -0,0 +1,16 @@
+--TEST--
+Test invalid bindto
+--FILE--
+<?php
+$ctx = stream_context_create([
+    'socket' => [
+        'bindto' => 'invalid',
+    ],
+]);
+$fp = stream_socket_client(
+    'tcp://www.' . str_repeat('x', 100) . '.com:80',
+    $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $ctx
+);
+?>
+--EXPECTF--
+Warning: stream_socket_client(): Unable to connect to tcp://%s:80 (Failed to parse address "invalid") in %s on line %d

main/streams/xp_socket.c

@@ -744,6 +744,10 @@ static inline int php_tcp_sockop_connect(php_stream *stream, php_netstream_data_
 			return -1;
 		}
 		bindto = parse_ip_address_ex(Z_STRVAL_P(tmpzval), Z_STRLEN_P(tmpzval), &bindport, xparam->want_errortext, &xparam->outputs.error_text);
+		if (bindto == NULL) {
+			efree(host);
+			return -1;
+		}
 	}
 
 #ifdef SO_BROADCAST