Fix GH-8176: Fix leaking enum values in property initializers

NEWS

@@ -2,6 +2,9 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 8.1.5
 
+- Core:
+  . Fixed bug GH-8176 (Enum values in property initializers leak). (Bob)
+
 - Intl:
   . Fixed bug GH-8115 (Can't catch arg type deprecation when instantiating Intl
     classes). (ilutov)

Zend/tests/enum/gh8176.phpt

@@ -0,0 +1,23 @@
+--TEST--
+Enum object in property initializer
+--FILE--
+<?php
+
+class AClass
+{
+    public $prop = AnEnum::Value;
+}
+
+enum AnEnum
+{
+    case Value;
+}
+
+var_dump(new AClass);
+
+?>
+--EXPECT--
+object(AClass)#2 (1) {
+  ["prop"]=>
+  enum(AnEnum::Value)
+}

Zend/zend_execute_API.c

@@ -329,6 +329,18 @@ ZEND_API void zend_shutdown_executor_values(bool fast_shutdown)
 						ZVAL_UNDEF(&c->value);
 					}
 				} ZEND_HASH_FOREACH_END();
+
+				/* properties may contain objects as well */
+				if (ce->default_properties_table) {
+					zval *p = ce->default_properties_table;
+					zval *end = p + ce->default_properties_count;
+
+					while (p != end) {
+						i_zval_ptr_dtor(p);
+						ZVAL_UNDEF(p);
+						p++;
+					}
+				}
 			}
 
 			if (ce->ce_flags & ZEND_HAS_STATIC_IN_METHODS) {