Bug #73555 [NEW]: imagepng() doesn't properly report failure

From: cmb Operating system: * PHP version: 5.6Git-2016-11-17 (Git) Package: GD related Bug Type: Bug Bug description:imagepng() doesn't properly report failure Description: ------------ imagepng() and other output functions don't properly report failure. For instance, if a read-only stream is passed to imagepng(), the function returns TRUE without any warning or notice, but obviously the image has not been written to the file. Test script: --------------- <?php $filename = __DIR__ . DIRECTORY_SEPARATOR . 'bug.png'; touch($filename); $stream = fopen($filename, 'r'); $im = imagecreatetruecolor(100, 100); var_dump(imagepng($im, $stream)); var_dump(filesize($filename)); Expected result: ---------------- bool(false) int(0) Actual result: -------------- bool(true) int(0) -- Edit bug report at https://bugs.php.net/bug.php?id=73555&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73555&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73555&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73555&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73555&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73555&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73555&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73555&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73555&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73555&r=support Expected behavior: https://bugs.php.net/fix.php?id=73555&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73555&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73555&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73555&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73555&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73555&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73555&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73555&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73555&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73555&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73555&r=mysqlcfg