[pschweitzer] 72067: [NTFS] Don't attempt to read beyond stream size. Patch by Trevor Thompson. CORE-11707

Author: pschweitzer
Date: Mon Aug  1 06:14:45 2016
New Revision: 72067

URL: http://svn.reactos.org/svn/reactos?rev=72067&view=rev
Log:
[NTFS]
Don't attempt to read beyond stream size.
Patch by Trevor Thompson.

CORE-11707

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

Modified: trunk/reactos/drivers/filesystems/ntfs/rw.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/ntfs/rw...
==============================================================================
--- trunk/reactos/drivers/filesystems/ntfs/rw.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/ntfs/rw.c	[iso-8859-1] Mon Aug  1 06:14:45 2016
@@ -147,7 +147,10 @@
         RealLength = ROUND_UP(ToRead, DeviceExt->NtfsInfo.BytesPerSector);
         /* do we need to extend RealLength by one sector? */
         if (RealLength + RealReadOffset < ReadOffset + Length)
-            RealLength += DeviceExt->NtfsInfo.BytesPerSector;
+        {
+            if (RealReadOffset + RealLength + DeviceExt->NtfsInfo.BytesPerSector <= AttributeAllocatedLength(&DataContext->Record))
+                RealLength += DeviceExt->NtfsInfo.BytesPerSector;
+        }

ReadBuffer = ExAllocatePoolWithTag(NonPagedPool, RealLength, TAG_NTFS);