Bug #74267 [NEW]: segfault with streams and invalid data

From: lindsay at notion dot ai Operating system: linux PHP version: 7.1.3 Package: Streams related Bug Type: Bug Bug description:segfault with streams and invalid data Description: ------------ The scenario to recreate the segfault: - use stream_filter_append to convert data on fwrite - try to write data which fails the convert process - blindly catch and ignore the failed fwrites - segfault happens on fclose Tested on 7.1.3, 7.0.13 and 5.6.28 Test script: --------------- $fh = fopen('/tmp/segfault.txt', 'w'); stream_filter_append( $fh, 'convert.quoted-printable-decode', STREAM_FILTER_WRITE, array( 'line-break-chars' => "\r\n" )); $lines = [ "\r\n", " -=()\r\n", " -=\r\n", "\r\n" ]; foreach ($lines as $line) { try { fwrite($fh, $line); } catch (\Exception $e) { } } fclose($fh); -- Edit bug report at https://bugs.php.net/bug.php?id=74267&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=74267&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=74267&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=74267&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=74267&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=74267&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=74267&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=74267&r=needscript Try newer version: https://bugs.php.net/fix.php?id=74267&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=74267&r=support Expected behavior: https://bugs.php.net/fix.php?id=74267&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=74267&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=74267&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=74267&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=74267&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=74267&r=dst IIS Stability: https://bugs.php.net/fix.php?id=74267&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=74267&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=74267&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=74267&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=74267&r=mysqlcfg