#27951 [NEW]: debug_backtrace crash after using ++ on unassigned overloaded object property
From: calum at lasham dot com
Operating system: Windows XP
PHP version: 5CVS-2004-04-11 (dev)
PHP Bug Type: Reproducible crash
Bug description: debug_backtrace crash after using ++ on unassigned overloaded object property
Description:
------------
When using the ++ operator on an overloaded object property that's not
assigned a value, a debug_backtrace() in another unrelated object causes a
crash. See example code to reproduce the problem.
Note 1: The script executes correctly if, in the example code...
$foo->bar++;
is replaced with...
$x = $foo->bar;
$x++;
$foo->bar = $x;
Note 2: if the __set method in class Setter actually sets the variable on
the object the script executes correctly.
The bug appears in php5rc1 and the snapshot Built On: Apr 11, 2004 10:30
GMT. crash occurs when using php as apache module or from command line.
Reproduce code:
---------------
<?php
class Setter {
function __get($nm){ }
function __set($nm, $val){ }
}
class Test {
function backtrace(){
debug_backtrace();
}
}
$foo = new Setter();
$foo->bar++;
$t = new Test();
$t->backtrace();
?>
Expected result:
----------------
"got exception" printed
Actual result:
--------------
apache service crash
--
Edit bug report at http://bugs.php.net/?id=27951&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=27951&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=27951&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=27951&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=27951&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=27951&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=27951&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=27951&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=27951&r=support
Expected behavior: http://bugs.php.net/fix.php?id=27951&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=27951&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=27951&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=27951&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27951&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=27951&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=27951&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=27951&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=27951&r=float
Thread (3 messages)
- calum at lasham dot com