wow64win: Skip WM_CREATE/WM_NCCREATE lParam conversion if NULL.

lParam being NULL is handled in win32u/defwnd.c so make sure to pass the NULL through rather than relying on the pointer always being valid since it may not be in this case.

wow64win: Skip WM_CREATE/WM_NCCREATE lParam conversion if NULL.
a632ac55 · Billy Laws · Alexandre Julliard · 83b86d18 · a632ac55
Commit a632ac55 authored Jul 11, 2023 by Billy Laws Committed by Alexandre Julliard Aug 10, 2023
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user.c dlls/wow64win/user.c +2 -0

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--- a/dlls/wow64win/user.c
+++ b/dlls/wow64win/user.c
@@ -3264,6 +3264,7 @@ static LRESULT message_call_32to64( HWND hwnd, UINT msg, WPARAM wparam, LPARAM l
    {
    case WM_NCCREATE:
    case WM_CREATE:
+        if (lparam)
        {
            CREATESTRUCT32 *cs32 = (void *)lparam;
            CREATESTRUCTW cs;
@@ -3282,6 +3283,7 @@ static LRESULT message_call_32to64( HWND hwnd, UINT msg, WPARAM wparam, LPARAM l
            cs32->dwExStyle      = cs.dwExStyle;
            return ret;
        }
+        return NtUserMessageCall( hwnd, msg, wparam, lparam, result_info, type, ansi );

    case WM_MDICREATE:
        {