Bug #72998 [NEW]: readline segfaults php on empty array returned from callback

From: lindsay at notion dot ai Operating system: osx 10.11.6 PHP version: 7.0.10 Package: Readline related Bug Type: Bug Bug description:readline segfaults php on empty array returned from callback Description: ------------ If the callback for readline_completion_function returns an empty array, php will segfault. When running the example code, hit tab to fire the callback. Test script: --------------- <?php readline_completion_function('readline_callback'); do { $command = readline('> '); echo 'command: ' . $command . PHP_EOL; } while ($command); function readline_callback($command) { return []; } -- Edit bug report at https://bugs.php.net/bug.php?id=72998&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72998&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72998&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72998&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72998&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72998&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72998&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72998&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72998&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72998&r=support Expected behavior: https://bugs.php.net/fix.php?id=72998&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72998&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72998&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72998&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72998&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72998&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72998&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72998&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72998&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72998&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72998&r=mysqlcfg