Bug #73612 [NEW]: preg_*() may leak memory

From: cmb Operating system: * PHP version: 7.0Git-2016-11-26 (Git) Package: PCRE related Bug Type: Bug Bug description:preg_*() may leak memory Description: ------------ As has been pointed out by Nikita[1], as of PHP 7.0.0 zval_dtor() is actually the same as zval_ptr_dtor_nogc(). Therefore preg_match() and some other PCRE functions may leak memory if objects are passed as $matches and $count, respectively. [1] <http://news.php.net/php.internals/97197> Test script: --------------- <?php $obj = new stdClass; $obj->obj = $obj; preg_match('/./', 'x', $obj); $obj = new stdClass; $obj->obj = $obj; preg_replace('/./', '', 'x', -1, $obj); $obj = new stdClass; $obj->obj = $obj; preg_replace_callback('/./', 'array_merge', 'x', -1, $obj); $obj = new stdClass; $obj->obj = $obj; preg_replace_callback_array(['/./' => 'array_merge'], 'x', -1, $obj); $obj = new stdClass; $obj->obj = $obj; preg_filter('/./', '', 'x', -1, $obj); Actual result: -------------- [Sat Nov 26 14:03:38 2016] Script: '/vagrant/leak.php' /vagrant/php-src/Zend/zend_objects.c(162) : Freeing 0x7FF12465ECD0 (40 bytes), script=/vagrant/leak.php Last leak repeated 4 times === Total 5 memory leaks detected === -- Edit bug report at https://bugs.php.net/bug.php?id=73612&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73612&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73612&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73612&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73612&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73612&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73612&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73612&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73612&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73612&r=support Expected behavior: https://bugs.php.net/fix.php?id=73612&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73612&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73612&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73612&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73612&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73612&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73612&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73612&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73612&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73612&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73612&r=mysqlcfg