[Bug 36636] valgrind shows an uninitialized write in shell32/tests/appbar.c

http://bugs.winehq.org/show_bug.cgi?id=36636

--- Comment #10 from Henri Verbeet  ---
(In reply to Bruno Jesus from comment #9)
> Actually there is no cbSize inside the command.abd struct.
>
> 39 struct appbar_data_msg  /* platform-independent data */
>  40 {
>  41     ULONG     hWnd;
>  42     UINT      uCallbackMessage;
>  43     UINT      uEdge;
>  44     RECT      rc;
>  45     ULONGLONG lParam;
>  46 };

...
> And all existing fields are already being written. The problem may be
> somewhere else then.

I really didn't read the bug very closely, but notice that there's a 4 byte
hole between "rc" and "lParam", because "lParam" is a 64-bit value and will be
aligned on an 8 byte boundary. If this structure is not visible to applications
you can trivially avoid the hole by reordering the fields, otherwise you could
perhaps add an explicit "padding" field.