From: stas
Operating system: MacOS X 10.6.6
PHP version: 5.3SVN-2011-03-16 (snap)
Package: Reproducible crash
Bug Type: Bug
Bug description:crash when variable gets reassigned in error handler
Description:
------------
Reported by Christian Holler on mailing list, the code below produces
invalid
memory access due to the fact that the line:
if (!Z_OBJ_HT_P(object)->write_property) {
tries to access handler table of the object variable while it's not an
object and
is not initialized.
Test script:
---------------
<?php
function my_errorhandler($errno,$errormsg) {
global $my_var;
$my_var = 0;
}
set_error_handler("my_errorhandler");
$my_var = str_repeat("A",$my_var[0]->errormsg = "xyz");
Actual result:
--------------
==81019== Invalid read of size 4
==81019== at 0x563FE7: zend_assign_to_object (in /Users/smalyshev/mphp)
==81019== by 0x563C0A: ZEND_ASSIGN_OBJ_SPEC_VAR_CONST_HANDLER (in
/Users/smalyshev/mphp)
==81019== by 0x53AACF: execute (in /Users/smalyshev/mphp)
==81019== by 0x510740: zend_execute_scripts (in /Users/smalyshev/mphp)
==81019== by 0x49D190: php_execute_script (in /Users/smalyshev/mphp)
==81019== by 0x5D2C35: main (in /Users/smalyshev/mphp)
==81019== Address 0x10 is not stack'd, malloc'd or (recently) free'd
==81019==
--
Edit bug report at http://bugs.php.net/bug.php?id=54265&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=54265&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=54265&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=54265&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=54265&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=54265&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=54265&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=54265&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=54265&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=54265&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=54265&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=54265&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=54265&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=54265&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=54265&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54265&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=54265&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=54265&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=54265&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=54265&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=54265&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=54265&r=mysqlcfg
