kern/78227: Destroying a network interface leaks kernel memory

[Brooks Davis]

>  I like OpenBSD's solution. Please look at the attached patch; it
>  adds in_multi pointer into in_ifaddr, assigns it return value of
>  in_addmulti() and calls in_delmulti() when removing address.

This looks fine to me.

>  P.S. I suspect we also have a memory leak when interface is joined a
>  multicast group and then destroyed.

Actually, I believe it's a panic. :(  I haven't had a chance to look at
it much, but I put what I found in kern/77665.  It's pretty easy to
trigger if you have a pccard/cardbus nic.

-- Brooks

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