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Fix GH-14124: Segmentation fault on unknown address 0x0001ffff8041 with XML extension under certain memory limit #14126

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Merged
merged 2 commits into from
May 4, 2024
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Fix GH-14124: Segmentation fault on unknown address 0x0001ffff8041 with XML extension under certain memory limit #14126

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4341fef
Fix GH-14124: Segmentation fault on unknown address 0x0001ffff8041 wi…
nielsdos May 4, 2024
cdb47ab
Fix test regex
nielsdos May 4, 2024
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27 changes: 27 additions & 0 deletions ext/xml/tests/gh14124.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
--TEST--
GH-14124 (Segmentation fault on unknown address 0x0001ffff8041 with XML extension under certain memory limit)
--EXTENSIONS--
xml
--INI--
memory_limit=33M
--SKIPIF--
<?php
if (!defined("LIBXML_VERSION")) die('skip this is a libxml2 test');
if (getenv('SKIP_ASAN')) die('xleak libxml does not use the request allocator');
?>
--FILE--
<?php
function createParser(bool $huge) {
$parser = xml_parser_create();
xml_parser_set_option($parser, XML_OPTION_PARSE_HUGE, $huge);
return $parser;
}

$long_text = str_repeat("A", 1000 * 1000 * 5 /* 5 MB */);
$long_xml_head = "<?xml version=\"1.0\"?><container><$long_text/><$long_text/><second>foo</second>";
$long_xml_tail = "</container>";
$parser = createParser(true);
xml_parse_into_struct($parser, $long_xml_head . $long_xml_tail, $values, $index);
?>
--EXPECTF--
Fatal error: Allowed memory size of %d bytes exhausted %s in %s on line %d
1 change: 1 addition & 0 deletions ext/xml/xml.c
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Expand Up @@ -1363,6 +1363,7 @@ PHP_FUNCTION(xml_parse_into_struct)
parser->level = 0;
xml_parser_free_ltags(parser);
parser->ltags = safe_emalloc(XML_MAXLEVEL, sizeof(char *), 0);
memset(parser->ltags, 0, XML_MAXLEVEL * sizeof(char *));

XML_SetElementHandler(parser->parser, _xml_startElementHandler, _xml_endElementHandler);
XML_SetCharacterDataHandler(parser->parser, _xml_characterDataHandler);
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