From 3998b1dfbf8309ffbb545b43947df710f7fc9d3b Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Sat, 14 Oct 2023 18:55:49 +0300
Subject: [PATCH] dougs fix for build

---
 ntoskrnl/mm/mmfault.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ntoskrnl/mm/mmfault.c b/ntoskrnl/mm/mmfault.c
index 7937f7b5e5b..de2a69e824b 100644
--- a/ntoskrnl/mm/mmfault.c
+++ b/ntoskrnl/mm/mmfault.c
@@ -239,7 +239,9 @@ MmAccessFault(IN ULONG FaultCode,
     if (MmGetKernelAddressSpace())
     {
         /* Check if this is an ARM3 memory area */
+        MmLockAddressSpace(MmGetKernelAddressSpace());
         MemoryArea = MmLocateMemoryAreaByAddress(MmGetKernelAddressSpace(), Address);
+        MmUnlockAddressSpace(MmGetKernelAddressSpace());
         if (!(MemoryArea) && (Address <= MM_HIGHEST_USER_ADDRESS))
         {
             /* Could this be a VAD fault from user-mode? */