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Bug #26697 calling class_exists on a nonexistent class in __autoload results in segfault
Submitted: 2003-12-22 16:03 UTC Modified: 2003-12-23 05:41 UTC
Votes:1
Avg. Score:1.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: arjen at glas dot its dot tudelft dot nl Assigned: helly (profile)
Status: Closed Package: Scripting Engine problem
PHP Version: 5.0.0b3 OS: *
Private report: No CVE-ID: None
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 [2003-12-22 16:03 UTC] 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();

?>

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 [2003-12-22 18:50 UTC] davidc at blesys dot com 
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.
 [2003-12-23 05:41 UTC] helly@php.net 
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
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