From: amelek32 at gmail dot com
Operating system: Windows XP Pro x64
PHP version: 5.2.6
PHP Bug Type: GD related
Bug description: imagepng() crashes on empty image
Description:
------------
imagepng *crashes* when no color was alocated.
I see no point in rendering blank images, but this functions behavior is
buggy.
All other functions (imagejpeg, imagegif) AND imagepng on true scale
images return black image. This is most likely expected result.
Instead, this function flushes some part of header and then crashes with
warnings when trying to convert non existing color palette.
GD Version bundled (2.0.34 compatible)
Reproduce code:
---------------
<?
$img = imagecreate(500,500);
//header("Content-type: image/png"); // skip this to see the problem, else
browser will ignore corrupted image.
imagepng($img);
imagedestroy($img);
?>
Expected result:
----------------
blank black image (like other image* functions) or E_WARNING without junk.
Actual result:
--------------
PNG IHDRôôñMÉ
Warning: imagepng() [function.imagepng]: gd-png: fatal libpng error:
Invalid number of colors in palette in C:\usr\apache\httpd\html\draw.php on
line 21
Warning: imagepng() [function.imagepng]: gd-png error: setjmp returns
error condition in C:\usr\apache\httpd\html\draw.php on line 21
--
Edit bug report at http://bugs.php.net/?id=45799&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=45799&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=45799&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=45799&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=45799&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=45799&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=45799&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=45799&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=45799&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=45799&r=support
Expected behavior: http://bugs.php.net/fix.php?id=45799&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=45799&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=45799&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=45799&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45799&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=45799&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=45799&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=45799&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=45799&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=45799&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=45799&r=mysqlcfg
