ID:               43201
 Updated by:       [EMAIL PROTECTED]
 Reported By:      stas at zend dot com
-Status:           Assigned
+Status:           Closed
 Bug Type:         Scripting Engine problem
 Operating System: *
 PHP Version:      5.2CVS-2007-11-05 (CVS)
 Assigned To:      dmitry
 New Comment:

This bug has been fixed in CVS.

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/.
 
Thank you for the report, and for helping us make PHP better.




Previous Comments:
------------------------------------------------------------------------

[2007-11-05 18:20:40] [EMAIL PROTECTED]

Shorter version:

<?php
class Foo {
        function __get($k) {
                return null;
        }
}

$c = new Foo();

$c->arr[0]["k"] = 1;
$c->arr[0]["k2"] = $undef;
for($cnt=0;$cnt<6;++$cnt) {
        $c->arr[$cnt]["k2"] = chop($undef);
}
?>

------------------------------------------------------------------------

[2007-11-05 18:15:07] stas at zend dot com

Description:
------------
Code modifying the result of __get (erroneously) and using undefined
variables crashes, apparently because of unitialized_zval being freed. 

Reproduce code:
---------------
<?php
class Foo {
        function __get($k) {
                return null;
        }
        function __set($k, $v) {
                $this->$k = $v;
        }
}

$c = new Foo();

$c->arr[0]["k"] = 1;
$c->arr[0]["k2"] = $ref;
for($cnt=0;$cnt<6;$cnt++) {
        $ref = chop($undef);    
        $c->arr[$cnt]["k2"] = $ref;
}
?>

Expected result:
----------------
No crash :)

Actual result:
--------------
On windows - crash
On Unix debug - 
php5/Zend/zend_hash.c(517) : ht=0xa533520 is being destroyed



------------------------------------------------------------------------


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