[Bug 284606] Kernel Panic with ipfw

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284606

--- Comment #15 from Kyle Evans <kevans@freebsd.org> ---
My completely uneducated guess, just looking at some of the related code, is
that this[0] case in tcpmod_setmss is wrong.  m_pullup failed so the original
mbuf was freed, but we return a simple IP_FW_DENY that doesn't get interpreted
as a terminal state up in the O_EXTERNAL_ACTION handler.  Rule processing
continues.

[0] https://cgit.freebsd.org/src/tree/sys/netpfil/ipfw/pmod/tcpmod.c#n76

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