[reactos] 01/01: [WIN32K:NTUSER] Make sure to hold User Global Lock before mapping desktop heap (#4144)

[Serge Gautherie]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=d375b7f6c5f6d78830670…

commit d375b7f6c5f6d78830670e88b7ea9063598d4354
Author:     Serge Gautherie <32623169+SergeGautherie(a)users.noreply.github.com>
AuthorDate: Sun Dec 19 23:34:35 2021 +0100
Commit:     GitHub <noreply(a)github.com>
CommitDate: Sun Dec 19 23:34:35 2021 +0100

    [WIN32K:NTUSER] Make sure to hold User Global Lock before mapping desktop heap
(#4144)
    
    Addendum to 8c098ee8d.
    CORE-17890
---
 win32ss/user/ntuser/desktop.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/win32ss/user/ntuser/desktop.c b/win32ss/user/ntuser/desktop.c
index 4d8f2956b44..43120cc7750 100644
--- a/win32ss/user/ntuser/desktop.c
+++ b/win32ss/user/ntuser/desktop.c
@@ -202,12 +202,16 @@ NTAPI
 IntDesktopObjectOpen(
     _In_ PVOID Parameters)
 {
+    NTSTATUS Ret;
     PWIN32_OPENMETHOD_PARAMETERS OpenParameters = Parameters;
     PPROCESSINFO ppi = PsGetProcessWin32Process(OpenParameters->Process);
     if (ppi == NULL)
         return STATUS_SUCCESS;
 
-    return IntMapDesktopView((PDESKTOP)OpenParameters->Object);
+    UserEnterExclusive();
+    Ret = IntMapDesktopView((PDESKTOP)OpenParameters->Object);
+    UserLeave();
+    return Ret;
 }
 
 NTSTATUS