Huw Davies : oleaut32: Clear any existing interface before calling WdtpInterfacePointer_UserUnmarshal ().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 9ed47775d6a789f0c397c622279ab861a3e8425f
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=9ed47775d6a789f0c397c62227...

Author: Huw Davies 
Date:   Tue Oct 27 14:42:30 2015 +0000

oleaut32: Clear any existing interface before calling WdtpInterfacePointer_UserUnmarshal().

The code has already called VariantClear() which has released the
interface yet not set it to NULL.  This is to prevent a double-release
after a forthcoming patch to WdtpInterfacePointer_UserUnmarshal().

Signed-off-by: Huw Davies 
Signed-off-by: Alexandre Julliard

---

dlls/oleaut32/usrmarshal.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/dlls/oleaut32/usrmarshal.c b/dlls/oleaut32/usrmarshal.c
index 39a5f8c..303ec69 100644
--- a/dlls/oleaut32/usrmarshal.c
+++ b/dlls/oleaut32/usrmarshal.c
@@ -349,11 +349,12 @@ static unsigned char *interface_variant_unmarshal(ULONG *pFlags, unsigned char *
   ptr = *(DWORD*)Buffer;
   Buffer += sizeof(DWORD);

+  /* Clear any existing interface which WdtpInterfacePointer_UserUnmarshal()
+     would try to release.  This has been done already with a VariantClear(). */
+  *ppunk = NULL;
+
   if(!ptr)
-  {
-      *ppunk = NULL;
       return Buffer;
-  }

return WdtpInterfacePointer_UserUnmarshal(pFlags, Buffer, ppunk, riid);
 }