Hi,

When synproxy_send_server_ack() calls synproxy_send_tcp(), it passes
NULL as third parameter (struct nf_conntrack *nfct). And the first thing
synproxy_send_tcp() does, is dereference it:

| struct net *net = nf_ct_net((struct nf_conn *)nfct);

I could not find a commit leading to this breakage in the commit log,
which makes me doubt ip6t_SYNPROXY has ever worked at all.

If you need one, I have a reproducer at hand. (Though I would want to
strip it down a bit first.) Just let me know.

Cheers, Phil
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