#44283 [Fbk->Opn]: After mysql_close () "Invalid pointer" and "Segmentation fault"

From: Date: Thu, 28 Feb 2008 17:16:28 +0000
Subject: #44283 [Fbk->Opn]: After mysql_close () "Invalid pointer" and "Segmentation fault"
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-122778@lists.php.net to get a copy of this message 
 ID:               44283
 User updated by:  izh1979 at gmail dot com
 Reported By:      izh1979 at gmail dot com
-Status:           Feedback
+Status:           Open
 Bug Type:         Reproducible crash
 Operating System: Linux 2.6.23.15-137.fc8
 PHP Version:      5.2.5
 New Comment:

For php5.2-200802281530 problem is actual:

Connected successfully.
[Thu Feb 28 20:15:31 2008]  Script:  '/home/bsg/www/t.php'
---------------------------------------
/home/bsg/php5.2-200802281530/ext/mysql/php_mysql.c(316) : Block
0x0a03d3fc status:
Invalid pointer: ((size=0x00000251) != (next.prev=0x00000000))
---------------------------------------
Disconnected successfully.
[Thu Feb 28 20:15:31 2008]  Script:  '/home/bsg/www/t.php'
---------------------------------------
/home/bsg/php5.2-200802281530/Zend/zend_opcode.c(240) : Block
0x0a03e0c4 status:
Invalid pointer: ((prev=0x00000a78) != (prev.size=0x00000000))
---------------------------------------
zend_mm_heap corrupted


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

[2008-02-28 16:55:39] felipe@php.net

Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows (zip):
 
  http://snaps.php.net/win32/php5.2-win32-latest.zip

For Windows (installer):

  http://snaps.php.net/win32/php5.2-win32-installer-latest.msi



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

[2008-02-28 15:14:31] izh1979 at gmail dot com

Description:
------------
PHP 5.2.5, MySQL 5.0.51a, for redhat-linux-gnu (i686) using  EditLine
wrapper.

Running test script with correct user password, you will see:

Connected successfully.
[Thu Feb 28 18:04:59 2008]  Script:  '/home/bsg/www/t.php'
---------------------------------------
/home/user/php/ext/mysql/php_mysql.c(316) : Block 0x08f54820 status:
Invalid pointer: ((size=0x00000251) != (next.prev=0x00000000))
---------------------------------------
Disconnected successfully.
[Thu Feb 28 18:04:59 2008]  Script:  '/home/bsg/www/t.php'
---------------------------------------
/home/user/php/Zend/zend_opcode.c(238) : Block 0x08f554e8 status:
Invalid pointer: ((prev=0x00000a78) != (prev.size=0x00000000))
---------------------------------------
zend_mm_heap corrupted
Segmentation fault

First problem occured in php_mysql.c(316) in function _close_mysql_link
on line "efree(link);". Second in zend_opcode.c in function
destroy_op_array on line "efree(op_array->vars[i].name);".

If you change hostname or password to wrong, you will see another
error:

Warning: mysql_connect(): Unknown MySQL server host 'localhost2' (1) in
/home/user/www/t.php on line 2
[Thu Feb 28 18:09:24 2008]  Script:  '/home/bsg/www/t.php'
---------------------------------------
/home/user/php/ext/mysql/php_mysql.c(831) : Block 0x097db818 status:
Invalid pointer: ((size=0x00000251) != (next.prev=0x00000000))
---------------------------------------
Could not connect: Unknown MySQL server host 'localhost2' (1)

There is no segmentation fault now. But the problem is. In file
php_mysql.c(831) the line is "efree(mysql);" in function
php_mysql_do_connect.

Reproduce code:
---------------
%
<?php
$link = mysql_connect ('localhost', 'login', 'password');
if (!$link)
  die ("Could not connect: ". mysql_error ());

echo "Connected successfully.\n";
mysql_close ($link);
echo "Disconnected successfully.\n";
?>




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


-- 
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