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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 (profile)
Status: Closed Package: GD related
PHP Version: 5.2.8, 5.3CVS, 6CVS (2008-12-09) OS: *
Private report: No CVE-ID: None
 [2008-08-12 13:29 UTC] amelek32 at gmail dot com


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 [2008-08-12 13:37 UTC]
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]
> 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]
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

$img = imagecreate(500,500);

should return empty page..

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

A to see if there are any colors associated with the image before outputting the image header.
 [2009-03-14 16:34 UTC]
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
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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