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

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 4f705f6f62185de6fa78b88b0aaec554a0fbf0de
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=4f705f6f62185de6fa78b88b0aaec554a0fbf0de

Author: Alexandros Frantzis <alexandros.frantzis at collabora.com>
Date:   Mon Apr 11 12:53:50 2022 +0300

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

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

---

 dlls/win32u/message.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/win32u/message.c b/dlls/win32u/message.c
index 46c42188d70..9479595ae53 100644
--- 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++)