id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5306	get_wmi_class_attribute crashes	habdank@…	Ion Gaztañaga	"Dears,

Independently of #4895, #5120 and #4350 there is yet another bug in function:

inline bool get_wmi_class_attribute( std::wstring& strValue, const wchar_t *wmi_class, const wchar_t *wmi_class_var)

in the file:

boost\interprocess\detail\win32_api.hpp

The problem is that at the end of function there is a sequence:

      pIWbemLocator->Release();
      pWbemServices->Release();
      pEnumObject->Release();
      pClassObject->Release();

But there is no guarantee that pClassObject != NULL especially that it is initilized to be NULL and then perhaps modification is made in:

pEnumObject->Next( WBEM_INFINITE_IG, uCount, &pClassObject, &uReturned )

but under some conditions pClassObject remains NULL and then

pClassObject->Release();

crashes with memory violation error.
Obviously when pClassObject == NULL then pClassObject->Release();
dereferences NULL pointer.

My honest suggestion would be to carefully track all execution paths
in that function to observe its complete behavior.

I would appreciate to get patch for that problem.
Temporarily I could patch myself, but that will have limited focus,
as I have no big picture.

Best regards,
Seweryn Habdank-Wojewodzki.




"	Bugs	closed	To Be Determined	interprocess	Boost 1.45.0	Showstopper	fixed