Merge branch 'PHP-7.3'

* PHP-7.3:
  Update NEWS
  Fixed bug #77664 (Segmentation fault when using undefined constant in custom wrapper)

Author: laruence

ext/standard/tests/streams/bug77664.phpt

@@ -0,0 +1,19 @@
+--TEST--
+BUG #77664 (Segmentation fault when using undefined constant in custom wrapper)
+--FILE--
+<?php
+class ErrorWrapper {
+	public $context;
+	public $var = self::INVALID;
+}
+stream_wrapper_register('error',ErrorWrapper::class);
+file_get_contents('error://test');
+?>
+--EXPECTF--
+Warning: file_get_contents(error://test): failed to open stream: operation failed in %sbug77664.php on line %d
+
+Fatal error: Uncaught Error: Undefined class constant 'self::INVALID' in %sbug77664.php:%d
+Stack trace:
+#0 %sbug77664.php(%d): file_get_contents('error://test')
+#1 {main}
+  thrown in %sbug77664.php on line %d

main/streams/userspace.c

@@ -287,7 +287,10 @@ static void user_stream_create_object(struct php_user_stream_wrapper *uwrap, php
 	}
 
 	/* create an instance of our class */
-	object_init_ex(object, uwrap->ce);
+	if (object_init_ex(object, uwrap->ce) == FAILURE) {
+		ZVAL_UNDEF(object);
+		return;
+	}
 
 	if (context) {
 		add_property_resource(object, "context", context->res);