Possible race in IPv6

Dear,

I'm facing some crash around manipulations of IPv6 address.

I already found that the commit 275593 will fix my issue.

However, after some code review, i see a possible race in the function 
nd6_na_input:

https://svnweb.freebsd.org/base/head/sys/netinet6/nd6_nbr.c?annotate=279676#l750

=-=-=-=-=-=-=-=-=-=
if (ifa
 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
 ifa_free(ifa);
 nd6_dad_na_input(ifa);
 goto freeit;
}
=-=-=-=-=-=-=-=-=-=

As you can see, the function drop its reference on the address and pass it to 
nd6_dad_na_input.
It should be better to release the reference after the call.

What about you?

Regards

-- 
Alexandre Martins
STORMSHIELD