simple.c

#include <ntddk.h>

#define SIMPLE_TAG 'pmis'

void* p;

void SimpleUnload(PDRIVER_OBJECT DriverObject) {
	UNREFERENCED_PARAMETER(DriverObject);
	DbgPrint("SimpleUnload called \n");

	if (p) {
		ExFreePool(p);
	}
}

NTSTATUS DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath) {
	UNREFERENCED_PARAMETER(DriverObject);

	DbgPrint("Simple DriverEntry called: %wZ\n", RegistryPath);
	p = NULL;

	DriverObject->DriverUnload = SimpleUnload;

	p = ExAllocatePoolWithTag(PagedPool, 100, SIMPLE_TAG);

	DbgPrint("Allocated pointer: 0x%p\n", p);

	return STATUS_SUCCESS;
}