win32u: Avoid iterating over a NULL window list when broadcasting.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com> Signed-off-by: Jacek Caban <jacek@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

win32u: Avoid iterating over a NULL window list when broadcasting.
4f705f6f · Alexandros Frantzis · Alexandre Julliard · b159edc6 · 4f705f6f
Commit 4f705f6f authored Apr 11, 2022 by Alexandros Frantzis Committed by Alexandre Julliard Apr 11, 2022
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message.c dlls/win32u/message.c +4 -2

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--- a/dlls/win32u/message.c
+++ b/dlls/win32u/message.c
@@ -2508,9 +2508,11 @@ static BOOL is_message_broadcastable( UINT msg )
 */
 static BOOL broadcast_message( struct send_message_info *info, DWORD_PTR *res_ptr )
 {
-    if (is_message_broadcastable( info->msg ))
+    HWND *list;
+
+    if (is_message_broadcastable( info->msg ) &&
+        (list = list_window_children( 0, get_desktop_window(), NULL, 0 )))
    {
-        HWND *list = list_window_children( 0, get_desktop_window(), NULL, 0 );
        int i;

        for (i = 0; list[i]; i++)