From: david at acz dot org
Operating system: SuSE Linux
PHP version: 5.2.3
PHP Bug Type: SimpleXML related
Bug description: Implicit conversion to string leaks memory
Description:
------------
Passing a SimpleXML string object to most builtin string functions causes
a memory leak.
Reproduce code:
---------------
#!/usr/local/bin/php -d memory_limit=128M
<?
$xml = '<?xml version="1.0" encoding="utf-8"?>';
$x = simplexml_load_string($xml . "<q><x>foo</x></q>");
echo "explicit conversion\n";
for ($i = 0; $i < 1000000; $i++)
md5(strval($x->x));
echo "no conversion\n";
for ($i = 0; $i < 1000000; $i++)
md5($x->x);
echo "done\n";
?>
Expected result:
----------------
$ ./crash.php
explicit conversion
no conversion
done
Actual result:
--------------
$ ./crash.php
explicit conversion
no conversion
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to
allocate 40 bytes) in /tmp/crash.php on line 12
--
Edit bug report at http://bugs.php.net/?id=42369&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=42369&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=42369&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=42369&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=42369&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=42369&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=42369&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=42369&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=42369&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=42369&r=support
Expected behavior: http://bugs.php.net/fix.php?id=42369&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=42369&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=42369&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=42369&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=42369&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=42369&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=42369&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=42369&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=42369&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=42369&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=42369&r=mysqlcfg
