Bug #73568 [Opn->Csd]: Using null coalescing operator with SplObjectStorage causes memory leak

Edit report at https://bugs.php.net/bug.php?id=73568&edit=1 ID: 73568 Updated by: laruence@php.net Reported by: tandre at ifwe dot co Summary: Using null coalescing operator with SplObjectStorage causes memory leak -Status: Open +Status: Closed Type: Bug Package: SPL related Operating System: Linux PHP Version: 7.0.13 -Assigned To: +Assigned To: laruence Block user comment: N Private report: N New Comment: fix has been merged.. Previous Comments: ------------------------------------------------------------------------ [2016-11-21 00:00:16] tandre at ifwe dot co Description: ------------ See https://github.com/php/php-src/pull/2215 for a description and a fix. The objects(keys) used for the null coalescing operator are leaked if the entry does not exist in the map. PHP 7.0.13(and 7.0.12, probably others) are affected, along with php 7.1.0RC6. (The null coalescing operator was introduced in 7.0) Test script: --------------- <?php $b = new stdClass(); $map = new SplObjectStorage(); var_export($map[$b] ?? null); // /usr/local/php-7.0.12-src/Zend/zend_objects.c(162) : Freeing 0x7F3957875A00 (40 bytes), script=/path/to/test.php Expected result: ---------------- No memory leaks. Null coalescing operator continues behaving equivalently to isset($hash[$obj]) ? $hash[$obj] : $default (which currently does not leak) Actual result: -------------- The return value of the coalescing operator was correct, but memory leaks are observed (visible in debug builds), of the form /usr/local/php-7.0.12-src/Zend/zend_objects.c(162) : Freeing 0x7F3957875A00 (40 bytes), script=/path/to/test.php ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=73568&edit=1