Bug #81092 [NEW]: Calling fflush before stream_filter_remove results in corrupted stream

From: mark at klb dot jp Operating system: Linux PHP version: 8.0.6 Package: Bzip2 Related Bug Type: Bug Bug description:Calling fflush before stream_filter_remove results in corrupted stream Description: ------------ When using filters to output bzip2 compressed data, one may be tempted to call fflush() before stream_filter_remove() to ensure all data has been written. This used to work fine, however since php8, this causes the generated stream to be corrupt. Test script: --------------- <?php if ($_SERVER['argv'][1]??'' == 'output') { $stream = fopen('php://output', 'wb+'); $filter = stream_filter_append($stream, 'bzip2.compress', STREAM_FILTER_WRITE, ['blocks' => 9, 'work' => 0]); fwrite($stream, random_bytes(8192)); fflush($stream); stream_filter_remove($filter); // should call dtor exit; } $script = $_SERVER['argv'][0]; $res = shell_exec('php '.escapeshellarg($script).' output'); // should output bz encoded data $data = bzdecompress($res); var_dump(strlen($data)); Expected result: ---------------- int(8192) Actual result: -------------- int(0) -- Edit bug report at https://bugs.php.net/bug.php?id=81092&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81092&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81092&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81092&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81092&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81092&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81092&r=support Expected behavior: https://bugs.php.net/fix.php?id=81092&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81092&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81092&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81092&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81092&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81092&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81092&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81092&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81092&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81092&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81092&r=mysqlcfg