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Bug #45799 imagepng() crashes on empty image
Submitted: 2008-08-12 13:29 UTC Modified: 2009-03-14 16:34 UTC
From: amelek32 at gmail dot com Assigned: pajoye
Status: Closed Package: GD related
PHP Version: 5.2.8, 5.3CVS, 6CVS (2008-12-09) OS: *
Private report: No CVE-ID:
 [2008-08-12 13:29 UTC] amelek32 at gmail dot com

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 [2008-08-12 13:37 UTC] pajoye@php.net
That's libpng behaviors. A PNG palette image must have colors to be saved.

By the way, warnings are not crashes.
 [2008-08-12 13:45 UTC] amelek32 at gmail dot com
shouldn't it return warning without putting part of header to output?
 [2008-08-12 14:25 UTC] pajoye@php.net
> shouldn't it return warning without putting part of header to output?

Hm, good point. I may add a check before calling the png function and avoid to much troubles later. I will do it for 5.3+
 [2008-11-30 22:52 UTC] pajoye@php.net
Well, after a 2nd look, the warning will remain anyway. Whether it is raised by libgd or php does not change anything > won't fix
 [2008-12-01 11:00 UTC] amelek32 at gmail dot com
then

<?
$img = imagecreate(500,500);
@imagepng($img);
imagedestroy($img);
?>

should return empty page..

However, it do not ;)
 [2008-12-01 11:02 UTC] pajoye@php.net
My bad, you are right!
 [2009-03-10 11:25 UTC] mmcnicklebugs at googlemail dot com
[PATCH]

A to see if there are any colors associated with the image before outputting the image header.

http://whompbox.com/patches/php/libgd.patch
 [2009-03-14 16:34 UTC] tabe@php.net
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.

Thanks for your patch, from which I made a fix in 5.3 and 6CVS.
 
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