From 0ca2bff44e1f9c84dd218a07e21628da464cfd82 Mon Sep 17 00:00:00 2001
From: Pierre Schweitzer <pierre@reactos.org>
Date: Fri, 7 Nov 2014 15:38:31 +0000
Subject: [PATCH] [FASTFAT] Properly check for volume open on lock request

svn path=/trunk/; revision=65309
---
 reactos/drivers/filesystems/fastfat/fsctl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/reactos/drivers/filesystems/fastfat/fsctl.c b/reactos/drivers/filesystems/fastfat/fsctl.c
index ab9d3afae2f..e27f8e868af 100644
--- a/reactos/drivers/filesystems/fastfat/fsctl.c
+++ b/reactos/drivers/filesystems/fastfat/fsctl.c
@@ -865,14 +865,16 @@ VfatLockOrUnlockVolume(
 {
     PFILE_OBJECT FileObject;
     PDEVICE_EXTENSION DeviceExt;
+    PVFATFCB Fcb;
 
     DPRINT("VfatLockOrUnlockVolume(%p, %d)\n", IrpContext, Lock);
 
     DeviceExt = IrpContext->DeviceExt;
     FileObject = IrpContext->FileObject;
+    Fcb = FileObject->FsContext;
 
     /* Only allow locking with the volume open */
-    if (FileObject->FsContext != DeviceExt->VolumeFcb)
+    if (!(Fcb->Flags & FCB_IS_VOLUME))
     {
         return STATUS_ACCESS_DENIED;
     }
-- 
2.17.1