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Bug #53903 streamwrapper/stream_stat causes problems
Submitted: 2011-02-01 15:58 UTC Modified: 2011-02-01 23:55 UTC
From: acid at rizzt dot kicks-ass dot org Assigned: cataphract
Status: Closed Package: Streams related
PHP Version: 5.3.5 OS: linux
Private report: No CVE-ID:
 [2011-02-01 15:58 UTC] acid at rizzt dot kicks-ass dot org
Description:
------------
I experienced odd things testing code that was working with 5.2.19.

It look like reading a file with file_get_contents using a streamwrapper class 
destroys some part of the zend engine. After reading the file all sorts of odd 
problems occur.

I tracked it down to undefined variables returned by stream_stat() in my stream 
wrapper class. Casting the values to an integer fixes it.





Test script:
---------------
class StreamWrapper {
  public function stream_stat() {

    return array(
      'atime' => $this->notset,
      'mtime' => $this->notset,
      'ctime' => $this->notset,
    );

  }
}


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 [2011-02-01 20:24 UTC] acid at rizzt dot kicks-ass dot org
Here is an entire script:

# php x.php

Warning: Cannot use a scalar value as an array in x.php on line 30


<?php

class sw {

    public function stream_open($path, $mode, $options, &$opened_path) {
        return true;
    }

    public function stream_read($count) {
		return FALSE;
    }

    public function stream_eof() {
        return true;
    }

	public function stream_stat() {
		return array(
            'atime' => $this->undefined,
        );

	}

}
stream_wrapper_register('sx', 'sw') or die('failed');

file_get_contents('sx://test');

unset($s);
$s[] = 1; //  Cannot use a scalar value as an array

print_r($s);

?
 [2011-02-01 20:54 UTC] cataphract@php.net
-Status: Open +Status: Verified
 [2011-02-01 21:52 UTC] cataphract@php.net
-Status: Verified +Status: Assigned -Assigned To: +Assigned To: cataphract
 [2011-02-01 23:55 UTC] cataphract@php.net
Automatic comment from SVN on behalf of cataphract
Revision: http://svn.php.net/viewvc/?view=revision&amp;revision=307934
Log: - Fixed bug #53903 (userspace stream stat callback does not separate the
  elements of the returned array before converting them).
 [2011-02-01 23:55 UTC] cataphract@php.net
-Status: Assigned +Status: Closed
 [2011-02-01 23:55 UTC] cataphract@php.net
Fixed in trunk and 5.3.
 
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