[PATCH v2 2/3] user32: Fail on NULL string in WM_GETTEXT AtoW wrapper.

[Aida Jonikienė]

From: Aida Jonikienė

Spotted in WM_GETTEXT NULL string tests.
---
 dlls/user32/winproc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/user32/winproc.c b/dlls/user32/winproc.c
index 5678e75b4e9..5254419e0a9 100644
--- a/dlls/user32/winproc.c
+++ b/dlls/user32/winproc.c
@@ -274,7 +274,7 @@ LRESULT WINPROC_CallProcAtoW( winproc_callback_t callback, HWND hwnd, UINT msg,
             LPSTR str = (LPSTR)lParam;
             DWORD len = wParam * sizeof(WCHAR);

-            if (!(ptr = get_buffer( buffer, sizeof(buffer), len ))) break;
+            if (!str || !(ptr = get_buffer( buffer, sizeof(buffer), len ))) break;
             ret = callback( hwnd, msg, wParam, (LPARAM)ptr, result, arg );
             if (wParam)
             {