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Added a check for end of fat chain before end of recorded length

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svn path=/trunk/; revision=1826
This commit is contained in:
Phillip Susi 2001-04-26 01:28:54 +00:00
parent 21cbb4fcc1
commit 595a5bad20
1 changed files with 5 additions and 5 deletions
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10
reactos/drivers/fs/vfat/rw.c
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@ -1,5 +1,5 @@
/* $Id: rw.c,v 1.22 2001/04/03 17:25:50 dwelch Exp $
/* $Id: rw.c,v 1.23 2001/04/26 01:28:54 phreak Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -384,7 +384,7 @@ VfatReadFile (PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
else
CurrentCluster = Fcb->entry.FirstCluster;
FirstCluster = CurrentCluster;
DPRINT( "FirstCluster = %x\n", FirstCluster );
/*
* Truncate the read if necessary
*/
@ -433,7 +433,7 @@ VfatReadFile (PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
* If the read doesn't begin on a chunk boundary then we need special
* handling
*/
if ((ReadOffset % ChunkSize) != 0)
if ((ReadOffset % ChunkSize) != 0 )
{
TempLength = min (Length, ChunkSize - (ReadOffset % ChunkSize));
VfatReadCluster(DeviceExt, Fcb, ROUND_DOWN(ReadOffset, ChunkSize),
@ -446,7 +446,7 @@ VfatReadFile (PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
ReadOffset = ReadOffset + TempLength;
}
while (Length >= ChunkSize)
while (Length >= ChunkSize && CurrentCluster)
{
VfatReadCluster(DeviceExt, Fcb, ReadOffset,
FirstCluster, &CurrentCluster, Buffer, NoCache, 0,
@ -457,7 +457,7 @@ VfatReadFile (PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
Length = Length - ChunkSize;
ReadOffset = ReadOffset + ChunkSize;
}
if (Length > 0)
if (Length > 0 && CurrentCluster)
{
VfatReadCluster(DeviceExt, Fcb, ReadOffset,
FirstCluster, &CurrentCluster, Buffer, NoCache, 0,