#33220 [Opn->Asn]: GIF image with errors makes imagecreatefromgif() go into infinite loop

ID: 33220 Updated by: sniper@php.net Reported By: phpbugs at pureftpd dot org -Status: Open +Status: Assigned Bug Type: GD related Operating System: * PHP Version: 5CVS-2005-08-17 Assigned To: pajoye New Comment: Pierre, are there still open issues in this report? If not, close this. Open separate reports for separate issues! Previous Comments: ------------------------------------------------------------------------ [2005-09-24 16:42:01] pajoye@php.net Patch applied in all active branches. I keep this bug as 'assigned' as there is other cases which cause an infinite loop. ------------------------------------------------------------------------ [2005-09-24 12:23:44] nlopess@php.net I've made a patch to fix this problem: http://mega.ist.utl.pt/~ncpl/php_gd_patch.txt The problem: GetDataBlock_() returns -1 on error, but most calls to that function were checking only == 0, thus creating the infinite loop. changing those to <=0 fixes the problems. ------------------------------------------------------------------------ [2005-06-02 15:11:16] phpbugs at pureftpd dot org Description: ------------ The following (invalid) picture triggers an infinite loop in gdImageCreateFromGif() with 100% CPU usage. Tested on Linux and OpenBSD, PHP4 with GD 1 and PHP5 with built-in GD. Reproduce code: --------------- <?php imagecreatefromgif('kaboom-gd.gif'); ?> Get kaboom-gd.gif from ftp://ftp.00f.net/misc/kaboom-gd.gif Expected result: ---------------- No 100% CPU usage. Actual result: -------------- 100% CPU usage, infinite loop. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=33220&edit=1