[PATCH v2] user32: When converting strings from A->W, ignore handles/resources

[Nikolay Sivov]

On 9/11/21 9:44 PM, Fabian Maurer wrote:
> Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51583
> Signed-off-by: Fabian Maurer <dark.shadow4 at web.de>
> ---
>  dlls/user32/tests/msg.c | 3 +++
>  dlls/user32/winproc.c   | 2 ++
>  2 files changed, 5 insertions(+)
>
> diff --git a/dlls/user32/tests/msg.c b/dlls/user32/tests/msg.c
> index 9867e319d58..3be5ccfd651 100644
> --- a/dlls/user32/tests/msg.c
> +++ b/dlls/user32/tests/msg.c
> @@ -15981,6 +15981,9 @@ static void test_desktop_winproc(void)
>
>      DestroyWindow(hwnd);
>
> +    /* Test invalid text with WM_SETTEXT. This must not crash. */
> +    SendMessageA(GetDesktopWindow(), WM_SETTEXT, 0, (LPARAM)55);
> +
>  out_unregister:
>      UnregisterClassA("TestDesktopClass", instance);
>  }

The test doesn't look adequate to the change you're making. Conversion
path affects more than just WM_SETTEXT, and it's better to use your own
class rather than desktop window.

> diff --git a/dlls/user32/winproc.c b/dlls/user32/winproc.c
> index 81fbcab928d..00b79b3b006 100644
> --- a/dlls/user32/winproc.c
> +++ b/dlls/user32/winproc.c
> @@ -494,6 +494,8 @@ LRESULT WINPROC_CallProcAtoW( winproc_callback_t callback, HWND hwnd, UINT msg,
>      case LB_ADDFILE:
>      case EM_REPLACESEL:
>          if (!lParam) ret = callback( hwnd, msg, wParam, lParam, result, arg );
> +        else if (IS_INTRESOURCE(lParam)) /* Check for handles/IDs similar to DEFWND_SetTextA */
> +            return 0;
>          else
>          {
>              WCHAR *ptr, buffer[512];