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Bug #68908 Invalid free in ext/opcache/zend_persist.c
Submitted: 2015-01-24 20:05 UTC Modified: 2015-01-24 23:33 UTC
From: bugreports at internot dot info Assigned:
Status: Not a bug Package: opcache
PHP Version: 5.5.21 OS: Linux Ubuntu 14.04
Private report: No CVE-ID: None
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 [2015-01-24 20:05 UTC] bugreports at internot dot info 
Description:
------------
Hi,

In /ext/opcache/zend_persist.c:


This is in a while() loop, so this is possible I think:



 82                        p->pData = &p->pDataPtr;



 79                        zend_accel_store(p->pData, el_size);

which frees p->pData, but it is a (void), which cannot hold memory.

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 [2015-01-24 22:41 UTC] stas@php.net
-Status: Open +Status: Feedback
 [2015-01-24 22:41 UTC] stas@php.net 
Could you please explain what you mean? " a (void), which cannot hold memory" doesn't make much sense to me, sorry - p->pData is a pointer, and I don't see any problem with it in either line 79 or line 82.
 [2015-01-24 23:16 UTC] bugreports at internot dot info
-Status: Feedback +Status: Open
 [2015-01-24 23:16 UTC] bugreports at internot dot info 
&p->pDataPtr
is a non-heap object.
 [2015-01-24 23:33 UTC] stas@php.net
-Summary: Invalid free +Summary: Invalid free in ext/opcache/zend_persist.c -Status: Open +Status: Not a bug -Type: Security +Type: Bug
 [2015-01-24 23:33 UTC] stas@php.net 
But p is reset each loop iteration, so I don't see how the same p->pData from previous loop in line 82 can appear in line 79 in the next loop.
 
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