Bug #69955 [NEW]: Segfault when trying to combine [] and assign-op on ArrayAccess object

From: stas@php.net Operating system: * PHP version: master-Git-2015-06-28 (Git) Package: Reproducible crash Bug Type: Bug Bug description:Segfault when trying to combine [] and assign-op on ArrayAccess object Description: ------------ When applying assign-operator (like +=) to result of $a[] when $a is an object implementing ArrayAccess, segfault happens. Test script: --------------- <?php class C10 implements ArrayAccess { function offsetExists($offset) { echo "\nInside " . __METHOD__ . "\n"; var_dump($offset); } function offsetGet($offset) { echo "\nInside " . __METHOD__ . "\n"; var_dump($offset); return 100; } function offsetSet($offset, $value) { echo "\nInside " . __METHOD__ . "\n"; var_dump($offset); var_dump($value); } function offsetUnset($offset) { echo "\nInside " . __METHOD__ . "\n"; var_dump($offset); } } $c10 = new C10; var_dump($c10[] += 5); Expected result: ---------------- No segfault Actual result: -------------- Inside C10::offsetGet NULL Segmentation fault: 11 -- Edit bug report at https://bugs.php.net/bug.php?id=69955&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=69955&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=69955&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=69955&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=69955&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=69955&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=69955&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=69955&r=needscript Try newer version: https://bugs.php.net/fix.php?id=69955&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=69955&r=support Expected behavior: https://bugs.php.net/fix.php?id=69955&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=69955&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=69955&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=69955&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=69955&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=69955&r=dst IIS Stability: https://bugs.php.net/fix.php?id=69955&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=69955&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=69955&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=69955&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=69955&r=mysqlcfg