On Sun, 20 Aug 2023 19:08:13 +0300 Ido Schimmel wrote: > There is another report here [1] with a reproducer [2]. Even with this > patch, the reproducer can still trigger the warning on net-next. Don't > we also need to reject a negative ifindex in the ancillary header? At > least with the following diff the warning does not trigger anymore: Yeah, definitely, please go ahead and submit. Is "ancillary header" used more commonly as a term? in gnel we usually call this thing "user header" or "fixed header".