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Fix GH-17037: UAF in user filter when adding existing filter name due to incorrect error handling #17038

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Fix GH-17037: UAF in user filter when adding existing filter name due to incorrect error handling #17038

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8 changes: 8 additions & 0 deletions ext/standard/tests/filters/gh17037.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
--TEST--
GH-17037 (UAF in user filter when adding existing filter name due to incorrect error handling)
--FILE--
<?php
var_dump(stream_filter_register('string.toupper', 'filter_string_toupper'));
?>
--EXPECT--
bool(false)
12 changes: 8 additions & 4 deletions ext/standard/user_filters.c
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Original file line number Diff line number Diff line change
Expand Up @@ -516,13 +516,17 @@ PHP_FUNCTION(stream_filter_register)
fdat = ecalloc(1, sizeof(struct php_user_filter_data));
fdat->classname = zend_string_copy(classname);

if (zend_hash_add_ptr(BG(user_filter_map), filtername, fdat) != NULL &&
php_stream_filter_register_factory_volatile(filtername, &user_filter_factory) == SUCCESS) {
RETVAL_TRUE;
if (zend_hash_add_ptr(BG(user_filter_map), filtername, fdat) != NULL) {
if (php_stream_filter_register_factory_volatile(filtername, &user_filter_factory) == SUCCESS) {
RETURN_TRUE;
}

zend_hash_del(BG(user_filter_map), filtername);
} else {
zend_string_release_ex(classname, 0);
efree(fdat);
RETVAL_FALSE;
}

RETURN_FALSE;
}
/* }}} */
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