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Bug #65182 Segmentation Fault by acces to class var in persitant mode
Submitted: 2013-07-02 10:24 UTC Modified: 2014-01-01 12:30 UTC
Votes:10
Avg. Score:4.6 ± 0.7
Reproduced:9 of 9 (100.0%)
Same Version:7 (77.8%)
Same OS:8 (88.9%)
From: radtke at hd-system dot de Assigned:
Status: Verified Package: PDO MySQL
PHP Version: 5.5.0 OS: Ubuntu 12.04
Private report: No CVE-ID:
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From: radtke at hd-system dot de
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 [2013-07-02 10:24 UTC] radtke at hd-system dot de
Description:
------------
create a class which extends the pdo class f.e. "extPDO"
use the persistant mode 
declare a class var f.e. "$sf"
create more then 1 object of the extPDO class and
take access to the class var "$sf"
causes a segmentation fault

no seg fault if:

1. you are NOT in persistant mode
2. you just create 1 instance of the class
2. you don't declare the class var; just set it in the constructor and take access to it

Noticed by accessing two different databases in a loop.

Test script:
---------------
class extPDO extends PDO
{
 public $sf;
 public function  __construct($db_name, $host, $username, $passwd)
 {
  $dsn = 'mysql:dbname='.$db_name.';host='.$host;
  $this->sf = '42';
  $options = array(PDO::ATTR_PERSISTENT => true);
  parent::__construct($dsn, $username, $passwd, $options);
  $this->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  $this->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
 }
}

function testExtPDO()
{
 for($i = 1; $i <= 2; $i++){
  try{
   $pdo_obj = new extPDO('csp2_mycms', 'csp2-db.pille.hds', 'root', '');
   $sql = 'SELECT user_id FROM user';
   $pdo_st = $pdo_obj->query($sql);
    if($row = $pdo_st->fetch(PDO::FETCH_ASSOC))
     echo $i.'.sf:'. $pdo_obj->sf."<br>";
  }
  catch(Exception $e){
   echo 'Exception: '.$e->getMessage().'<br>';
  }
 }
}
testExtPDO();

Expected result:
----------------
no segmentation fault

Actual result:
--------------
segmentation fault

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2013-07-03 03:45 UTC] laruence@php.net
-Status: Open +Status: Verified
 [2013-07-03 03:45 UTC] laruence@php.net
I can reproduce, will look into it later
 [2013-09-20 09:54 UTC] radtke at hd-system dot de
What's the status of this bug? It's pretty bad to use non persistant mode in multi tier scenarios on enterprise environments.
 [2014-01-01 12:30 UTC] felipe@php.net
-Package: PDO related +Package: PDO MySQL
 
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