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sys: keep extra fsvol device reference

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Reference an fsvol device at CREATE time and dereference at CLOSE time,
to ensure that fsvol remains around for DeviceIoControl operations done
after CLEANUP.
This commit is contained in:
Bill Zissimopoulos 2022-06-09 10:07:43 +01:00
parent 22bf0b09ef
commit a7a526351f
3 changed files with 7 additions and 1 deletions
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3
src/sys/close.c
View File

@ -43,6 +43,9 @@ static NTSTATUS FspFsctlClose(
{
PAGED_CODE();
if (0 != IrpSp->FileObject->FsContext2)
FspDeviceDereference(IrpSp->FileObject->FsContext2);
Irp->IoStatus.Information = 0;
return STATUS_SUCCESS;
}

4
src/sys/create.c
View File

@ -116,7 +116,11 @@ static NTSTATUS FspFsctlCreate(
if (0 == FileObject->RelatedFileObject &&
PREFIXW_SIZE <= FileObject->FileName.Length &&
RtlEqualMemory(PREFIXW, FileObject->FileName.Buffer, PREFIXW_SIZE))
{
Result = FspVolumeCreate(DeviceObject, Irp, IrpSp);
if (NT_SUCCESS(Result) && 0 != IrpSp->FileObject->FsContext2)
FspDeviceReference(IrpSp->FileObject->FsContext2);
}
else
{
Result = STATUS_SUCCESS;

1
src/sys/volume.c
View File

@ -417,7 +417,6 @@ static VOID FspVolumeDeleteNoLock(
PDEVICE_OBJECT FsvolDeviceObject = IrpSp->FileObject->FsContext2;
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(FsvolDeviceObject);
IrpSp->FileObject->FsContext2 = 0;
/* stop the I/O queue */
FspIoqStop(FsvolDeviceExtension->Ioq, TRUE);