[Bug 219472] Out of bounds access in vlan

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219472

--- Comment #1 from Mark Johnston <markj at FreeBSD.org> ---
vlan(4) doesn't even export the struct ifv_linkmib structure to userspace.  It
never has, as far as I can see, and all other uses of if_linkmib use it to
export standard MIBs to userspace.  I think it's a mistake that vlan(4) sets
if_linkmib to begin with.

It's also worth nothing that no modern drivers set if_linkmib, so the
IFDATA_LINKSPECIFIC interface is effectively obsolete.

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