From: jpgraph at aditus dot nu
Operating system: Linux
PHP version: 4.3.6
PHP Bug Type: Reproducible crash
Bug description: Bundled GD2 crashes when antialias is enabled
Description:
------------
Bundled GD2 in 4.3.4, 4.3.5 and 4.3.6 crashes when antialias is enabled.
When antialias is enabled through the imageantialias($img,$flag) function
then the Apache process crashes when trying to paint a line at the edge of
the image.
This is reproducible 100% using Apache 1.3.28 on our setup. If antialias
is disabled everything works fine.
It seems to be a boundary problem on the edge of the image. See example
below.
Reproduce code:
---------------
<?php
//
// This script will generate a Seg Fault on Linux
//
$im = imagecreatetruecolor(300, 300);
$w = imagecolorallocate($im, 255, 255, 255);
$red = imagecolorallocate($im, 255, 0, 0);
imagefilledrectangle($im,0,0,299,299,$w);
imageantialias($im,true);
imageline($im, 299, 299, 0, 299, $red);
header("Content-type: image/png");
imagepng($im);
imagedestroy($im);
?>
Expected result:
----------------
A line from bottom right corner to bottom left corner.
Actual result:
--------------
PHP Segmentation fault
--
Edit bug report at http://bugs.php.net/?id=28147&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=28147&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=28147&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=28147&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=28147&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=28147&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=28147&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=28147&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=28147&r=support
Expected behavior: http://bugs.php.net/fix.php?id=28147&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=28147&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=28147&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=28147&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=28147&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=28147&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=28147&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=28147&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=28147&r=float
