Bug #71154 [NEW]: Incorrect HT iterator invalidation causes iterator reuse

From: nikic Operating system: PHP version: 7.0Git-2015-12-17 (Git) Package: Scripting Engine problem Bug Type: Bug Bug description:Incorrect HT iterator invalidation causes iterator reuse Description: ------------ When iterators are removed on HT destruction we NULL out iter->ht entries. This will allow the iter to be reused. However it may still be in use by the foreach loop. In this case one iter will be shared between two loops/iterators. Test script: --------------- <?php $array = [1, 2, 3]; foreach ($array as &$ref) { /* Free array, causing free of iterator */ $array = []; /* Reuse the iterator. * However it will also be reused on next foreach iteration */ $it = new ArrayIterator([1, 2, 3]); $it->rewind(); } var_dump($it->current()); Expected result: ---------------- int(1) Actual result: -------------- NULL -- Edit bug report at https://bugs.php.net/bug.php?id=71154&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71154&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71154&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71154&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71154&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71154&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71154&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71154&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71154&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71154&r=support Expected behavior: https://bugs.php.net/fix.php?id=71154&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71154&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71154&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71154&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71154&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71154&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71154&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71154&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71154&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71154&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71154&r=mysqlcfg