_DEVICE_OBJECT *__stdcall IopGetDeviceAttachmentBase(_DEVICE_OBJECT *DeviceObject){
_DEVICE_OBJECT *v1;
_DEVICE_OBJECT *i;
v1 = DeviceObject;
for( i = DeviceObject->DeviceObjectExtension->AttachedTo; i; i = i->DeviceObjectExtension->AttachedTo )
v1 = i;
return v1;
}