add test

Author: devnexen

ext/sockets/tests/gh21161.phpt

@@ -0,0 +1,19 @@
+--TEST--
+GH-21161 (IPV6_PKTINFO socket option crash with null addr array entry)
+--EXTENSIONS--
+sockets
+--SKIPIF--
+<?php
+if (substr(PHP_OS, 0, 3) == 'WIN') {
+    die('skip.. Not valid for Windows');
+}
+?>
+--FILE--
+<?php
+$sock = socket_create(AF_INET6, SOCK_DGRAM, 0);
+socket_set_option($sock, IPPROTO_IPV6, IPV6_PKTINFO, ['addr' => null, 'ifindex' => 0]);
+?>
+--EXPECTF--
+Warning: socket_set_option(): Host lookup failed [%i]: %s on line %d
+
+Warning: socket_set_option(): error converting user data (path: in6_pktinfo > addr): could not resolve address '' to get an AF_INET6 address in %s on line %d