[pschweitzer] 74914: [UDFS] Fix broken implementation of UDFGetFullNameInformation(). Always return full name length so that caller can allocate a big-enough buffer for later call. CORE-4375

Author: pschweitzer
Date: Sun Jun  4 16:59:25 2017
New Revision: 74914

URL: http://svn.reactos.org/svn/reactos?rev=74914&view=rev
Log:
[UDFS]
Fix broken implementation of UDFGetFullNameInformation().
Always return full name length so that caller can allocate a big-enough buffer for later call.

CORE-4375

Modified:
    trunk/reactos/drivers/filesystems/udfs/fileinfo.cpp

Modified: trunk/reactos/drivers/filesystems/udfs/fileinfo.cpp
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/udfs/fi...
==============================================================================
--- trunk/reactos/drivers/filesystems/udfs/fileinfo.cpp	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/udfs/fileinfo.cpp	[iso-8859-1] Sun Jun  4 16:59:25 2017
@@ -831,20 +831,22 @@
  IN OUT PLONG                      PtrReturnedLength
     )
 {
+    ULONG BytesToCopy;
     NTSTATUS RC = STATUS_SUCCESS;

AdPrint(("UDFGetFullNameInformation\n"));

PtrBuffer->FileNameLength = FileObject->FileName.Length;
+    BytesToCopy = FileObject->FileName.Length;

if (PtrBuffer->FileNameLength + sizeof( ULONG ) > (ULONG)(*PtrReturnedLength)) {

-        PtrBuffer->FileNameLength = *PtrReturnedLength - sizeof( ULONG );
+        BytesToCopy = *PtrReturnedLength - sizeof( ULONG );
         RC = STATUS_BUFFER_OVERFLOW;
     }

-    RtlCopyMemory( PtrBuffer->FileName, FileObject->FileName.Buffer, PtrBuffer->FileNameLength );
+    RtlCopyMemory( PtrBuffer->FileName, FileObject->FileName.Buffer, BytesToCopy );

//  Reduce the available bytes by the amount stored into this buffer.
     *PtrReturnedLength -= sizeof( ULONG ) + PtrBuffer->FileNameLength;