Hello Leon, > > My concern is related to maintainability in long run. Your check adds > another layer of cabal knowledge which will be copied/pasted in other > places. > > Thanks > Yeah, I guess you are right. I guess I should not just *fix* this issue but also think of the maintainability. The very first idea pop into my mind is to complete the necessary nla_policy hence the invalid nlattrs could be rejected at the very first place. Will spend more time on this. Regards Lin