Handle out of order destruction of RecursiveIteratorIterator

Author: nikic

ext/spl/spl_iterators.c

@@ -160,16 +160,18 @@ static void spl_recursive_it_dtor(zend_object_iterator *_iter)
 	spl_recursive_it_object   *object = Z_SPLRECURSIVE_IT_P(&iter->intern.data);
 	zend_object_iterator      *sub_iter;
 
-	while (object->level > 0) {
-		if (!Z_ISUNDEF(object->iterators[object->level].zobject)) {
-			sub_iter = object->iterators[object->level].iterator;
-			zend_iterator_dtor(sub_iter);
-			zval_ptr_dtor(&object->iterators[object->level].zobject);
+	if (object->iterators) {
+		while (object->level > 0) {
+			if (!Z_ISUNDEF(object->iterators[object->level].zobject)) {
+				sub_iter = object->iterators[object->level].iterator;
+				zend_iterator_dtor(sub_iter);
+				zval_ptr_dtor(&object->iterators[object->level].zobject);
+			}
+			object->level--;
 		}
-		object->level--;
+		object->iterators = erealloc(object->iterators, sizeof(spl_sub_iterator));
+		object->level = 0;
 	}
-	object->iterators = erealloc(object->iterators, sizeof(spl_sub_iterator));
-	object->level = 0;
 
 	zval_ptr_dtor(&iter->intern.data);
 }
@@ -905,6 +907,7 @@ static void spl_RecursiveIteratorIterator_free_storage(zend_object *_object)
 			object->level--;
 		}
 		efree(object->iterators);
+		object->iterators = NULL;
 	}
 
 	zend_object_std_dtor(&object->std);

ext/spl/tests/RecursiveIteratorIterator_dtor_order.phpt

@@ -0,0 +1,14 @@
+--TEST--
+Handle object_iterator being destroyed before the RecursiveIteratorIterator object
+--FILE--
+<?php
+
+$dummy = new stdClass; // Dummy object to control object store ordering
+$it = new RecursiveIteratorIterator(new RecursiveArrayIterator([1]));
+unset($dummy);
+foreach ($it as $v) {
+    eval('class self {}'); // Cause a bailout.
+}
+?>
+--EXPECTF--
+Fatal error: Cannot use 'self' as class name as it is reserved in %s on line %d