From 6be79eaefac164776f65d487bcefdbc05782d945 Mon Sep 17 00:00:00 2001
From: Joachim Henze <Joachim.Henze@reactos.org>
Date: Thu, 3 Dec 2020 02:10:42 +0100
Subject: [PATCH] [0.4.10][WIN32K:NTUSER] Acquire the user lock exclusively in
 NtUserGetSystemMenu CORE-15512

It is rare, but I have seen this crash happening as well
when interacting with the taskbar quickly after the boot.

fix picked from 0.4.12-dev-203-g c526f94
---
 win32ss/user/ntuser/menu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/win32ss/user/ntuser/menu.c b/win32ss/user/ntuser/menu.c
index 7b4ba1e0a2c..4ab004db6d3 100644
--- a/win32ss/user/ntuser/menu.c
+++ b/win32ss/user/ntuser/menu.c
@@ -5454,7 +5454,7 @@ NtUserGetSystemMenu(HWND hWnd, BOOL bRevert)
    DECLARE_RETURN(HMENU);
 
    TRACE("Enter NtUserGetSystemMenu\n");
-   UserEnterShared();
+   UserEnterExclusive();
 
    if (!(Window = UserGetWindowObject(hWnd)))
    {