I believe I am catching out the way out. Do I have to MmProbeAndLockPages the Irp->UserBuffer???
NTSTATUS SentToLowerDriversCompletionRoutine(PDEVICE_OBJECT fdo, PIRP Irp,
PDEVICE_EXTENSION pdx)
{
if (Irp->PendingReturned)
IoMarkIrpPending(Irp);
PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(Irp);
if (stack->MajorFunction == IRP_MJ_DEVICE_CONTROL) {
GUID* pGuid = (GUID*)stack->Parameters.DeviceIoControl.Type3InputBuffer;
if (stack->Parameters.DeviceIoControl.IoControlCode == IOCTL_KS_PROPERTY)
{
if ((pKP->Set == KSPROPSETID_Pin)&& (pKP->Id ==
KSPROPERTY_PIN_DATARANGES)&& stack->Parameters.DeviceIoControl.OutputBufferLength> 0) {
// Irp->UserBuffer is ZeroMemoryied ???
}
}
}
IoReleaseRemoveLock(&pdx->RemoveLock, Irp);
return STATUS_SUCCESS;
}
NTSTATUS SentToLowerDrivers(PDEVICE_OBJECT fdo, PIRP Irp)
{
PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension;
NTSTATUS status = IoAcquireRemoveLock(&pdx->RemoveLock, Irp);
if (!NT_SUCCESS(status)) return CompleteRequest(Irp, status, 0);
IoCopyCurrentIrpStackLocationToNext(Irp);
IoSetCompletionRoutine(Irp, (PIO_COMPLETION_ROUTINE)
SentToLowerDriversCompletionRoutine, pdx, TRUE, TRUE, TRUE);
return IoCallDriver(pdx->LowerDeviceObject, Irp);
}
NTSTATUS DispatchAny(IN PDEVICE_OBJECT fido, IN PIRP Irp)
{
// I got some code here.
// ...
return SentToLowerDrivers(fido, Irp);
}
Remember that IOCTL_KS_PROPERTY is a METHOD_NEITHER IRP. The input buffer is in Type3InputBuffer. You're catching this on the way back out of the pin, right?
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