#40858 [Opn->Asn]: Thread safety issue in GD

ID: 40858 Updated by: tony2001@php.net Reported By: scottmacvicar at ntlworld dot com -Status: Open +Status: Assigned Bug Type: GD related Operating System: RHEL 4 PHP Version: 5.2.1 -Assigned To: +Assigned To: pajoye New Comment: Assigned to the maintainer. Previous Comments: ------------------------------------------------------------------------ [2007-03-19 18:41:15] scottmacvicar at ntlworld dot com Description: ------------ Appears to be still several more thread safety issues in GD, I've not had time to track these all down yet. We're running gdft.c from CVS to fix a few identified issues already. Looking at the code there still appears to be a race condition within the code but it appears to be a pretty tight loop since its not happening as often as before. By looking at gdft.c it looks possible for a fontCache entry to exist during a check, by the time it gets to obtaining the lock the fontCache has been cleared or something similarly evil. The backtrace we've got is: http://public.vbulletin.com/bugs/php/gdcache-bt.txt Patch for first issue to deal with the possibility that a cache entry is null: http://public.vbulletin.com/bugs/php/gdcache-patch-1.txt Potential patch for second issue to deal with gdCacheSetup thread safety: http://public.vbulletin.com/bugs/php/gdcache-patch-2.txt ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=40858&edit=1