Bug #63882 [PATCH]: zend_std_compare_objects crash on recursion

Edit report at https://bugs.php.net/bug.php?id=63882&edit=1 ID: 63882 Patch added by: ab@php.net Reported by: gynvael at coldwind dot pl Summary: zend_std_compare_objects crash on recursion Status: Open Type: Bug Package: Reproducible crash Operating System: any PHP Version: 5.4.10 Block user comment: N Private report: N New Comment: The following patch has been added/updated: Patch Name: 63882.patch Revision: 1357152805 URL: https://bugs.php.net/patch-display.php?bug=63882&patch=63882.patch&revision=1357152805 Previous Comments: ------------------------------------------------------------------------ [2013-01-01 19:27:30] gynvael at coldwind dot pl Description: ------------ The standard PHP object compare handler (zend_std_compare_objects) together with the == operator (compare_function) have no limit on nesting levels nor any anti- recursion protection. The array comparing function in compare_function does have this protection. It would be good to add it to the object standard compare handler as well. Test script: --------------- <?php class Test { public $x = 5; } $testobj1 = new Test; $testobj2 = new Test; $testobj1->x = $testobj1; $testobj2->x = $testobj2; $testobj1 == $testobj2; // Crash (stack exhaustion) Expected result: ---------------- PHP Fatal error: Nesting level too deep - recursive dependency? in test.php on line 9 Actual result: -------------- segmentation fault (core dumped) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=63882&edit=1