#26697 [Com]: calling class_exists on a nonexistent class in __autoload results in segfault
| From: | davidc at blesys dot com | Date: | Mon, 22 Dec 2003 23:50:01 +0000 |
| Subject: | #26697 [Com]: calling class_exists on a nonexistent class in __autoload results in segfault | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-52419@lists.php.net to get a copy of this message | ||
ID: 26697
Comment by: davidc at blesys dot com
Reported By: arjen at glas dot its dot tudelft dot nl
Status: Open
Bug Type: Zend Engine 2 problem
Operating System: Linux
PHP Version: 5CVS-2003-12-22 (dev)
New Comment:
What happens, I think, is that __autoload starts recursing endlessly.
Do this:
$autotracker=false;
function __autoload ($n) {
global $autotracker; $n=strtolower($n);
if ($autotracker==$n)die("Attempting to autoload $n again");
$autotracker=$n;
....//rest of function __autoload
}//end __autoload
Probably a bug, but rather easy to fix by the client programmer. I
think the bug I found today w/ thrown exceptions is much more dangerous
(http://bugs.php.net/bug.php?id=26698) because you can't really fix it
for all cases.
Previous Comments:
------------------------------------------------------------------------
[2003-12-22 16:03:57] arjen at glas dot its dot tudelft dot nl
Description:
------------
When calling class_exists on a nonexistent classname in __autoload,
you'll get a segfault.
This is in beta1, beta2 and beta3 (and now I had the time to create a
testcase and do a report). Which ran under apache2 (2.0.48) on gentoo
linux.
And then I saw this report:
http://bugs.php.net/bug.php?id=26630&edit=2
So I downloaded the php5-200312222030 snapshot and there it also
segfaults...
Reproduce code:
---------------
<?
function __autoload($classname)
{
if(!class_exists('test'))
{
echo "This won't be reached due to a segfault";
}
}
$test = new test();
?>
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=26697&edit=1