[ekohl] 67492: [FASTFAT] VfatRead: Check the Length before checking the ByteOffset because reading 0 bytes should always be successful.

Author: ekohl
Date: Fri May  1 12:15:49 2015
New Revision: 67492

URL: http://svn.reactos.org/svn/reactos?rev=67492&view=rev
Log:
[FASTFAT]
VfatRead: Check the Length before checking the ByteOffset because reading 0 bytes should
always be successful.

Modified:
    trunk/reactos/drivers/filesystems/fastfat/rw.c

Modified: trunk/reactos/drivers/filesystems/fastfat/rw.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/rw.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/rw.c	[iso-8859-1] Fri May  1 12:15:49 2015
@@ -599,6 +599,13 @@
        goto ByeBye;
     }
 
+    if (Length == 0)
+    {
+        IrpContext->Irp->IoStatus.Information = 0;
+        Status = STATUS_SUCCESS;
+        goto ByeBye;
+    }
+
     if (ByteOffset.QuadPart >= Fcb->RFCB.FileSize.QuadPart)
     {
        IrpContext->Irp->IoStatus.Information = 0;
@@ -615,13 +622,6 @@
             Status = STATUS_INVALID_PARAMETER;
             goto ByeBye;
         }
-    }
-
-    if (Length == 0)
-    {
-        IrpContext->Irp->IoStatus.Information = 0;
-        Status = STATUS_SUCCESS;
-        goto ByeBye;
     }
 
     if (Fcb->Flags & FCB_IS_VOLUME)