From 63db6b034d71cc5230af7848b46064b61f814eec Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Tue, 29 Nov 2011 04:22:51 +0000
Subject: [PATCH 1/1] [NTOSKRNL] - Add missing user PFN bitmap locking in
 MmRemoveLRUUserPage

svn path=/trunk/; revision=54531
---
 reactos/ntoskrnl/mm/freelist.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/reactos/ntoskrnl/mm/freelist.c b/reactos/ntoskrnl/mm/freelist.c
index f8efc073964..308c323f5d0 100644
--- a/reactos/ntoskrnl/mm/freelist.c
+++ b/reactos/ntoskrnl/mm/freelist.c
@@ -121,11 +121,15 @@ VOID
 NTAPI
 MmRemoveLRUUserPage(PFN_NUMBER Page)
 {
+    KIRQL OldIrql;
+
     /* Unset the page as a user page */
     ASSERT(Page != 0);
     ASSERT_IS_ROS_PFN(MiGetPfnEntry(Page));
     ASSERT(RtlCheckBit(&MiUserPfnBitMap, (ULONG)Page));
+    OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
     RtlClearBit(&MiUserPfnBitMap, (ULONG)Page);
+    KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
 }
 
 BOOLEAN
-- 
2.17.1