Windows filter driver BSOD on WDFREQUEST duplication

I am currently trying to write a serial filter driver that would be able to modify the data on read wdf requests.

The idea is to create a new WDFREQUEST object in the read callback function, here is what I do :

1. Create a new request

WdfRequestCreate(WDF_NO_OBJECT_ATTRIBUTES, target, &newRequest);

2. Create new WDFMEMORY

WdfMemoryCreate(WDF_NO_OBJECT_ATTRIBUTES, NonPagedPool, 'MyPi', Length, &newMemory, &newBuffer);

3. Get the request memory and buffer

WdfRequestRetrieveOutputMemory(Request, &outputMemory);outputBuffer = WdfMemoryGetBuffer(outputMemory, NULL);

4. Copy the data

WdfMemoryCopyFromBuffer(newMemory, 0, outputBuffer, Length);

5. Format the new request with the new memory

WdfIoTargetFormatRequestForRead(target, newRequest, newMemory, NULL, NULL);

6. Finally, set completion routine and send the new request

WdfRequestSetCompletionRoutine(newRequest, FilterEvtIoReadCompletionRoutine, filterContext);WdfRequestSend(newRequest, target, WDF_NO_SEND_OPTIONS);

But this code yields me a BSOD...If I replace newRequest by Request and newMemory by outputMemory in 5) and 6) the data is correclty transmitted and no error is produced.

Does anyone know where could be the problem ?Thank you in advance,Axel