[tfaber] 73086: [0.4.3] - Merge the fastfat fix for Chrome committed in r73072 CORE-12132

Author: tfaber
Date: Sun Oct 30 20:32:02 2016
New Revision: 73086

URL: http://svn.reactos.org/svn/reactos?rev=73086&view=rev
Log:
[0.4.3]
- Merge the fastfat fix for Chrome committed in r73072
CORE-12132

Modified:
    branches/ros-branch-0_4_3/   (props changed)
    branches/ros-branch-0_4_3/reactos/   (props changed)
    branches/ros-branch-0_4_3/reactos/drivers/filesystems/fastfat/rw.c

Propchange: branches/ros-branch-0_4_3/
------------------------------------------------------------------------------
--- svn:mergeinfo	(original)
+++ svn:mergeinfo	Sun Oct 30 20:32:02 2016
@@ -1 +1 @@
-/trunk:73043,73075,73077
+/trunk:73043,73072,73075,73077

Propchange: branches/ros-branch-0_4_3/reactos/
------------------------------------------------------------------------------
--- svn:mergeinfo	(original)
+++ svn:mergeinfo	Sun Oct 30 20:32:02 2016
@@ -21,4 +21,4 @@
 /branches/usb-bringup:51335,51337,51341-51343,51348,51350,51353,51355,51365-51369,51372,51384-54388,54396-54398,54736-54737,54752-54754,54756-54760,54762,54764-54765,54767-54768,54772,54774-54777,54781,54787,54790-54792,54797-54798,54806,54808,54834-54838,54843,54850,54852,54856,54858-54859
 /branches/usb-bringup-trunk:55019-55543,55548-55554,55556-55567
 /branches/wlan-bringup:54809-54998
-/trunk/reactos:73043,73075,73077
+/trunk/reactos:73043,73072,73075,73077

Modified: branches/ros-branch-0_4_3/reactos/drivers/filesystems/fastfat/rw.c
URL: http://svn.reactos.org/svn/reactos/branches/ros-branch-0_4_3/reactos/drivers...
==============================================================================
--- branches/ros-branch-0_4_3/reactos/drivers/filesystems/fastfat/rw.c	[iso-8859-1] (original)
+++ branches/ros-branch-0_4_3/reactos/drivers/filesystems/fastfat/rw.c	[iso-8859-1] Sun Oct 30 20:32:02 2016
@@ -656,11 +656,6 @@
     }

Buffer = VfatGetUserBuffer(IrpContext->Irp, BooleanFlagOn(IrpContext->Irp->Flags, IRP_PAGING_IO));
-    Status = VfatLockUserBuffer(IrpContext->Irp, Length, IoWriteAccess);
-    if (!NT_SUCCESS(Status))
-    {
-        goto ByeBye;
-    }

if (!(IrpContext->Irp->Flags & (IRP_NOCACHE|IRP_PAGING_IO)) &&
         !(Fcb->Flags & (FCB_IS_PAGE_FILE|FCB_IS_VOLUME)))
@@ -711,6 +706,12 @@
     else
     {
         // non cached read
+        Status = VfatLockUserBuffer(IrpContext->Irp, Length, IoWriteAccess);
+        if (!NT_SUCCESS(Status))
+        {
+            goto ByeBye;
+        }
+
         if (ByteOffset.QuadPart + Length > ROUND_UP_64(Fcb->RFCB.FileSize.QuadPart, BytesPerSector))
         {
             Length = (ULONG)(ROUND_UP_64(Fcb->RFCB.FileSize.QuadPart, BytesPerSector) - ByteOffset.QuadPart);
@@ -921,12 +922,6 @@
     }

Buffer = VfatGetUserBuffer(IrpContext->Irp, BooleanFlagOn(IrpContext->Irp->Flags, IRP_PAGING_IO));
-    Status = VfatLockUserBuffer(IrpContext->Irp, Length, IoReadAccess);
-    if (!NT_SUCCESS(Status))
-    {
-        Status = STATUS_INVALID_USER_BUFFER;
-        goto ByeBye;
-    }

if (!(Fcb->Flags & (FCB_IS_FAT|FCB_IS_VOLUME)) &&
         !(IrpContext->Irp->Flags & IRP_PAGING_IO) &&
@@ -987,6 +982,12 @@
     else
     {
         // non cached write
+        Status = VfatLockUserBuffer(IrpContext->Irp, Length, IoReadAccess);
+        if (!NT_SUCCESS(Status))
+        {
+            Status = STATUS_INVALID_USER_BUFFER;
+            goto ByeBye;
+        }

if (ByteOffset.QuadPart > OldFileSize.QuadPart)
         {