关于文件过滤驱动显示全路径名的问题

各位老大帮忙看一下 下面是修改sfilter的代码 但是用着用着就蓝屏了（FileObject已经在外面限制不是null了）
PUNICODE_STRING
SfGetFileName(
 IN PFILE_OBJECT FileObject,
 IN OUT PGET_NAME_CONTROL NameControl
 )
{
    POBJECT_NAME_INFORMATION nameInfo;
    NTSTATUS status;
    ULONG size;
    ULONG bufferSize;

    NameControl->allocatedBuffer = NULL;
    nameInfo = (POBJECT_NAME_INFORMATION)NameControl->smallBuffer;
    bufferSize = sizeof(NameControl->smallBuffer);
status =RtlVolumeDeviceToDosName(
(PVOID)FileObject->DeviceObject,
&(nameInfo->Name));
size=nameInfo->Name.Length;
DbgPrint(\"The Size is:%d \\n\",size);
    if (status == STATUS_BUFFER_OVERFLOW)
{
        bufferSize = size + sizeof(WCHAR);
        NameControl->allocatedBuffer = ExAllocatePoolWithTag(
NonPagedPool,
bufferSize,
SFLT_POOL_TAG );
        if (NULL == NameControl->allocatedBuffer) {
            RtlInitEmptyUnicodeString(
                (PUNICODE_STRING)&NameControl->smallBuffer,
                (PWCHAR)(NameControl->smallBuffer + sizeof(UNICODE_STRING)),
                (USHORT)(sizeof(NameControl->smallBuffer) - sizeof(UNICODE_STRING)) );
            return (PUNICODE_STRING)&NameControl->smallBuffer;
        }
        nameInfo = (POBJECT_NAME_INFORMATION)NameControl->allocatedBuffer;
        status =RtlVolumeDeviceToDosName(
(PVOID)FileObject->DeviceObject,
&(nameInfo->Name));
size=nameInfo->Name.Length;
DbgPrint(\"The Size2 is:%d \\n\",size);
}
    if (NT_SUCCESS( status ))
{
        ULONG newSize;
        PCHAR newBuffer;
        POBJECT_NAME_INFORMATION newNameInfo;
        newSize = size + FileObject->FileName.Length;
        if (NULL != FileObject->RelatedFileObject)
{
            newSize += FileObject->RelatedFileObject->FileName.Length +
sizeof(WCHAR);
        }
        if (newSize > bufferSize)
{
            newBuffer = ExAllocatePoolWithTag(
NonPagedPool,
newSize,
SFLT_POOL_TAG );
            if (NULL == newBuffer)
{
                RtlInitEmptyUnicodeString(
                    (PUNICODE_STRING)&NameControl->smallBuffer,
                    (PWCHAR)(NameControl->smallBuffer + sizeof(UNICODE_STRING)),
                    (USHORT)(sizeof(NameControl->smallBuffer) - sizeof(UNICODE_STRING)) );

                return (PUNICODE_STRING)&NameControl->smallBuffer;
            }
            newNameInfo = (POBJECT_NAME_INFORMATION)newBuffer;
            RtlInitEmptyUnicodeString(
                &newNameInfo->Name,
                (PWCHAR)(newBuffer + sizeof(OBJECT_NAME_INFORMATION)),
                (USHORT)(newSize - sizeof(OBJECT_NAME_INFORMATION)) );

            RtlCopyUnicodeString( &newNameInfo->Name,
&nameInfo->Name );
            if (NULL != NameControl->allocatedBuffer)
{

                ExFreePool( NameControl->allocatedBuffer );
            }
            NameControl->allocatedBuffer = newBuffer;
            bufferSize = newSize;
            nameInfo = newNameInfo;

        } else
{
            nameInfo->Name.MaximumLength = (USHORT)(bufferSize -
sizeof(OBJECT_NAME_INFORMATION));
        }
        if (NULL != FileObject->RelatedFileObject)
{

DbgPrint(\"FileObject->RelatedFileObject->FileName: %ws\",&(FileObject->RelatedFileObject->FileName.Buffer));
            RtlAppendUnicodeStringToString(
&nameInfo->Name,
&FileObject->RelatedFileObject->FileName );

            RtlAppendUnicodeToString( &nameInfo->Name, L\"\\\\\" );
        }
DbgPrint(\"FileObject->FileName:\",&(FileObject->FileName.Buffer));
        RtlAppendUnicodeStringToString(
&nameInfo->Name,
&FileObject->FileName );
        ASSERT(nameInfo->Name.Length <= nameInfo->Name.MaximumLength);
    }
    return &nameInfo->Name;
}


[编辑 -  5/16/05 by  yuzhe]