[Bug 58983] New: Wow64 applications crash when initializing WinMM

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58983

Bug ID: 58983
           Summary: Wow64 applications crash when initializing WinMM
           Product: Wine
           Version: 10.19
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winealsa.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 79705
  --> http://bugs.winehq.org/attachment.cgi?id=79705
Stacktrace

If a Wow64 application initializes WinMM by (for example) calling
waveOutGetNumDevs(), it will crash with an access violation. The reason is that
the structure "is_format_supported_params" has a different definition in
mmdevapi.dll than it does in winealsa.drv:

https://gitlab.winehq.org/wine/wine/-/blob/18ce7964203b486c8236f2c16a370ae27...

https://gitlab.winehq.org/wine/wine/-/blob/18ce7964203b486c8236f2c16a370ae27...

winealsa.drv has an extra field "fmt_out" which shifts the field "result" down
by 4 bytes. As a result, winealsa ends up writing the result outside of the
DLL-allocated buffer, clobbering a stack-saved register which then later causes
the crash.

To reproduce, simply compile the following as a 32-bit .exe:

#include <windows.h>

int main()
{
    waveOutGetNumDevs();
    return 0;
}

Then run on a 64-bit Wine prefix.