[Bug 56768] New: uxtheme crash when using themed CheckBoxes

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56768

Bug ID: 56768
           Summary: uxtheme crash when using themed CheckBoxes
           Product: Wine
           Version: 9.9
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: uxtheme
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 76569
  --> https://bugs.winehq.org/attachment.cgi?id=76569
uxtheme patch

Initially found here https://jira.reactos.org/browse/CORE-16410 but also
applicable to Wine 9.9 staging as "latent bug"

comctl32/button.c CB_ThemedPaint, before
https://github.com/wine-mirror/wine/commit/830348d78c38e9f68772bd6e5a3ea2555...
passed NULL as LPCRECT   prc for GetThemePartSize (allowed as per
https://learn.microsoft.com/en-en/windows/win32/api/uxtheme/nf-uxtheme-getth...
) then get_image_part_size then UXTHEME_LoadImage then UXTHEME_SelectImage
which unconditionnally calls

POINT size = {pRect->right-pRect->left, pRect->bottom-pRect->top};

without checking pRect as non-NULL

Attached patch (to be adapted here) prevents such a case.