[aandrejevic] 68607: [FASTFAT] Irp->UserBuffer being NULL doesn't indicate any error. It could be that the caller really wants the result stored at address NULL (which can be valid, and is valid by...

Author: aandrejevic
Date: Fri Aug  7 03:30:05 2015
New Revision: 68607

URL: http://svn.reactos.org/svn/reactos?rev=68607&view=rev
Log:
[FASTFAT]
Irp->UserBuffer being NULL doesn't indicate any error. It could be that the
caller really wants the result stored at address NULL (which can be valid,
and is valid by default for programs like NTVDM).

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/fastfat...
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/rw.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/rw.c	[iso-8859-1] Fri Aug  7 03:30:05 2015
@@ -656,7 +656,7 @@
     }

Buffer = VfatGetUserBuffer(IrpContext->Irp, BooleanFlagOn(IrpContext->Irp->Flags, IRP_PAGING_IO));
-    if (!Buffer)
+    if (!Buffer && IrpContext->Irp->MdlAddress)
     {
         Status = STATUS_INVALID_USER_BUFFER;
         goto ByeBye;
@@ -927,7 +927,7 @@
     OldFileSize = Fcb->RFCB.FileSize;

Buffer = VfatGetUserBuffer(IrpContext->Irp, BooleanFlagOn(IrpContext->Irp->Flags, IRP_PAGING_IO));
-    if (!Buffer)
+    if (!Buffer && IrpContext->Irp->MdlAddress)
     {
         Status = STATUS_INVALID_USER_BUFFER;
         goto ByeBye;