Who owns the WDFMEMORY in a WDFREQUEST?

Question

I am writing a Windows kernel driver. I need to create a new I/O request and allocate my own memory for the input buffer.

// Create request
WDFREQUEST request;
status = WdfRequestCreate(WDF_NO_OBJECT_ATTRIBUTES, target, &request);
if (!NT_SUCCESS(status)) {
    goto exit;
}

// Allocate buffer for request
WDFMEMORY inputMemory;
status = WdfMemoryCreate(WDF_NO_OBJECT_ATTRIBUTES, PagedPool, 0, 1024, &inputMemory, NULL);
if (!NT_SUCCESS(status)) {
    goto exit;
}

// Assign input buffer to request
status = WdfIoTargetFormatRequestForIoctl(target, request, IOCTL_FOO, inputMemory, NULL, NULL, NULL);
if (!NT_SUCCESS(status)) {
    goto exit;
}

// Asynchronously send the ioctl request
WdfRequestSetCompletionRoutine(request, MyCompletionRoutine, NULL);
if (!WdfRequestSend(request, target, NULL)) {
    status = WdfRequestGetStatus(request);
    goto exit;
}

My question is, if WdfIoTargetFormatRequestForIoctl completes successfully, should I also perform WdfObjectDelete(inputMemory) in my cleanup, or will WdfObjectDelete(request) destroy both the memory and the request? Also, is the answer the same for both the error cleanup within the function and in the completion routine?

Answer 1

According to this the Driver object owns the memory, it will only be cleanup when you unloaded the driver.

if you can done with with the memory you should call WdfObjectDelete() to be not keep unused memory.