[Bug 48735] New: OVERLAPPED struct has uninitialized bytes

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48735

            Bug ID: 48735
           Summary: OVERLAPPED struct has uninitialized bytes
           Product: Wine
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: jeffersoncarpenter2 at gmail.com
      Distribution: ---

Created attachment 66619
  --> https://bugs.winehq.org/attachment.cgi?id=66619
Configure output.

Steps to reproduce

* Check out 26ffc40bfb42b7c05ce9513bf479e31eb85294b1 (latest commit as of this
posting).  Configure and build wine.  (Configure output attached)
* Disable wine preloader to make valgrind a little quieter
* Compile a test program (I used 'int main() { return 0; }') using
i686-w64-mingw32-gcc
* Run this under valgrind.  Valgrind output attached.

The topmost error is

 ==30622== Syscall param writev(vector[...]) points to uninitialised byte(s)
...
 ==30622==    by 0x406EFD80: process_send_command (rpc.c:1137)

The root cause is that the OVERLAPPED struct does not have Offset and
OffsetHigh initialized before they are written into the wineserver request
pipe.

In this case, the target file is the process_entry's control_pipe.  MSDN
specifies the Offset and OffsetHigh members must be zero when writing to a file
that does not support seeking
(https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-overlapped).

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