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Bug #63121 enchant_broker_free_dict destroys broker resource
Submitted: 2012-09-20 11:11 UTC Modified: 2018-01-02 15:26 UTC
From: robert dot johnson at icap dot com Assigned: cmb (profile)
Status: Closed Package: Enchant related
PHP Version: 5.4.7 OS: Win XP SP 3
Private report: No CVE-ID: None
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 [2012-09-20 11:11 UTC] robert dot johnson at icap dot com 
Description:
------------
Calling enchant_broker_free_dict destroys the resource created by enchant_broker_init(), instead of just the dictionary resource.

Test script:
---------------
if ( PHP_SAPI != 'cli' )
	header('Content-Type:text/plain;charset=UTF-8');
$r = enchant_broker_init();
debug_zval_dump($r);
$d = enchant_broker_request_pwl_dict($r, 'c:\mydict.dic');
enchant_broker_free_dict($d);
debug_zval_dump($r);
echo "End.\r\n";


Expected result:
----------------
resource(1) of type (enchant_broker) refcount(2)
resource(1) of type (enchant_broker) refcount(2)
End.

Actual result:
--------------
resource(1) of type (enchant_broker) refcount(2)
resource(1) of type (Unknown) refcount(2)
End.

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 [2012-09-20 11:22 UTC] robert dot johnson at icap dot com 
This code works, so bug is probably related to function enchant_broker_request_pwl_dict():

if ( PHP_SAPI != 'cli' )
	header('Content-Type:text/plain;charset=UTF-8');
$r = enchant_broker_init();
debug_zval_dump($r);
$d = enchant_broker_request_dict($r, 'en-gb');
enchant_broker_free_dict($d);
debug_zval_dump($r);
echo "End.\r\n";

Result:

resource(1) of type (enchant_broker) refcount(2)
resource(1) of type (enchant_broker) refcount(2)
End.
 [2012-09-20 11:32 UTC] robert dot johnson at icap dot com 
Further testing reveals that Enchant broker resource is also destroyed when the PWL dictionary resource goes out of scope.
 [2018-01-01 18:03 UTC] cmb@php.net 
For some reason the broker resource is indeed freed when the dict
is freed[1].

[1] <https://github.com/php/php-src/blob/PHP-7.2.0/ext/enchant/enchant.c#L276>
 [2018-01-02 15:26 UTC] cmb@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: cmb
 [2018-01-02 15:26 UTC] cmb@php.net 
> For some reason the broker resource is indeed freed when the
> dict is freed

No.  zend_list_delete() only decreases the refcount here.
Actually, I'm not able to reproduce the reported behavior under
PHP-7.1, so I assume this issue had been fixed in the meantime.
 
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