Pablo Neira Ayuso wrote:
If we create a conntrack that has NAT handlings and a helper, the helper is assigned twice. This happens because nf_nat_setup_info() - via nf_conntrack_alter_reply() - sets the helper before ctnetlink, which indeed does not check if the conntrack already has a helper as it thinks that it is a brand new conntrack. The fix moves the helper assignation before the set of the status flags. This avoids a bogus assertion in __nf_ct_ext_add (if netfilter assertions are enabled) which checks that the conntrack must not be confirmed. This problem was introduced in 2.6.23 with the netfilter extension infrastructure.
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