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Fixed bug #75420 (Crash when modifing property name in __isset for BP_VAR_IS)

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This commit is contained in:
Xinchen Hui
2017-10-26 10:07:08 +08:00
parent 578ba71b3b
commit d2047503cb
3 changed files with 22 additions and 2 deletions
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2
NEWS
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@@ -3,6 +3,8 @@ PHP NEWS
?? ??? 2017 PHP 7.0.26
- Core:
. Fixed bug #75420 (Crash when modifing property name in __isset for
BP_VAR_IS). (Laruence)
. Fixed bug #75368 (mmap/munmap trashing on unlucky allocations). (Nikita,
Dmitry)

15
Zend/tests/bug75420.phpt Normal file
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@@ -0,0 +1,15 @@
--TEST--
Bug #75420 (Crash when modifing property name in __isset for BP_VAR_IS)
--FILE--
<?php
class Test {
public function __isset($x) { $GLOBALS["name"] = 24; return true; }
public function __get($x) { var_dump($x); return 42; }
}
$obj = new Test;
$name = "foo";
var_dump($obj->$name ?? 12);
?>
--EXPECT--

7
Zend/zend_object_handlers.c
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@@ -510,6 +510,7 @@ zval *zend_std_read_property(zval *object, zval *member, int type, void **cache_
zval tmp_member;
zval *retval;
uint32_t property_offset;
zend_long *guard = NULL;
zobj = Z_OBJ_P(object);
@@ -545,7 +546,7 @@ zval *zend_std_read_property(zval *object, zval *member, int type, void **cache_
/* magic isset */
if ((type == BP_VAR_IS) && zobj->ce->__isset) {
zval tmp_object, tmp_result;
zend_long *guard = zend_get_property_guard(zobj, Z_STR_P(member));
guard = zend_get_property_guard(zobj, Z_STR_P(member));
if (!((*guard) & IN_ISSET)) {
ZVAL_COPY(&tmp_object, object);
@@ -569,7 +570,9 @@ zval *zend_std_read_property(zval *object, zval *member, int type, void **cache_
/* magic get */
if (zobj->ce->__get) {
zend_long *guard = zend_get_property_guard(zobj, Z_STR_P(member));
if (guard == NULL) {
guard = zend_get_property_guard(zobj, Z_STR_P(member));
}
if (!((*guard) & IN_GET)) {
zval tmp_object;