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Bug #70863 Incorect logic to increment_function for proxy objects
Submitted: 2015-11-05 19:35 UTC Modified: 2015-11-09 23:45 UTC
From: jsoumelidis at gmail dot com Assigned: ab (profile)
Status: Closed Package: Reproducible crash
PHP Version: 7.0.0RC6 OS: Windows
Private report: No CVE-ID: None
View Developer Edit
 [2015-11-05 19:35 UTC] jsoumelidis at gmail dot com 
Description:
------------
Assume you have a (custom) proxy object that one wants to increment it's value ($obj++).
If get/set object handlers are defined for this object, the "increment_function" requests a zval* from the get handler in order to icrement it's value and assign it back to the proxy object through the set handler.
The problem is that the increment_function executes a Z_ADDREF_P on the returned zval* from the get handler which crashes the proccess in case the returned pointer  is not a refcounted zval.
File: zend_operators.c Line: 2280

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 [2015-11-06 22:11 UTC] ab@php.net 
Automatic comment on behalf of ab
Revision: http://git.php.net/?p=php-src.git;a=commit;h=8155ecba61a9c724c7b2bdeb673602ae27923d71
Log: Fixed bug #70863 Incorect logic to increment_function for proxy objects
 [2015-11-06 22:11 UTC] ab@php.net
-Status: Open +Status: Closed
 [2015-11-07 13:29 UTC] jsoumelidis at gmail dot com 
Same fix should be applied to functions "ZEND_TRY_BINARY_OP1_OBJECT_OPERATION" (zend_operators.h:760) and "decrement_function" (zend_operators.c:2348)
 [2015-11-09 18:12 UTC] ab@php.net 
Automatic comment on behalf of ab
Revision: http://git.php.net/?p=php-src.git;a=commit;h=68910e314ff62bd9f326cc11a48bfd65e5a32220
Log: Fixed bug #70863 Incorect logic to increment_function for proxy objects
 [2015-11-09 23:45 UTC] ab@php.net
-Assigned To: +Assigned To: ab
 [2015-11-09 23:45 UTC] ab@php.net 
Yeah, the decrement function was already done, thanks for the other catch, done in a3f1154b3d95aa9508cef19102ad553fed4f9189.

Thanks.
 [2016-07-20 11:35 UTC] davey@php.net 
Automatic comment on behalf of ab
Revision: http://git.php.net/?p=php-src.git;a=commit;h=8155ecba61a9c724c7b2bdeb673602ae27923d71
Log: Fixed bug #70863 Incorect logic to increment_function for proxy objects
 
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