[Bug 273207] pf_syncookie_mac for IPv6 random cause panic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273207

--- Comment #16 from Rin Cat <dev@rincat.ch> ---
Not sure what's happened, 

SipHash_Update(&ctx, pd->src, sizeof(pd->src->v6));

pd->src (struct pf_addr *) 0xfffff8010a3cae6e
become
(const uint8_t *) 0x0
in SipHash_Update

Before 
        if (ctx->buflen > 0 || len < 8)
                len -= SipBuf(ctx, &s, len, 0);

And you cannot copy from NULL.

bcopy(*src, &ctx->buf.b8[ctx->buflen], x);

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