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Fix use-after-free on object released in hook #16058

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Fix use-after-free on object released in hook #16058

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20 changes: 20 additions & 0 deletions Zend/tests/property_hooks/gh16040.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
--TEST--
GH-16040: Use-after-free on object released in hook
--FILE--
<?php

class A {
public $bar {
get {
$GLOBALS['a'] = null;
return 42;
}
}
}

$a = new A();
var_dump($a->bar);

?>
--EXPECT--
int(42)
4 changes: 2 additions & 2 deletions Zend/zend_object_handlers.c
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Expand Up @@ -828,8 +828,8 @@ ZEND_API zval *zend_std_read_property(zend_object *zobj, zend_string *name, int

if (EXPECTED(cache_slot
&& zend_execute_ex == execute_ex
&& zobj->ce->default_object_handlers->read_property == zend_std_read_property
&& !zobj->ce->create_object
&& ce->default_object_handlers->read_property == zend_std_read_property
&& !ce->create_object
&& !zend_is_in_hook(prop_info)
&& !(prop_info->hooks[ZEND_PROPERTY_HOOK_GET]->common.fn_flags & ZEND_ACC_RETURN_REFERENCE))) {
ZEND_SET_PROPERTY_HOOK_SIMPLE_GET(cache_slot);
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