Re: [PATCH] netfilter: nf_conntrack: fix RCU race innf_conntrack_find_get

[Florian Westphal]

Andrew Vagin <avagin@xxxxxxxxxxxxx> wrote:
> Can we allocate conntrack with zero ct_general.use and increment it at
> the first time before inserting the conntrack into the hash table?
> When conntrack is allocated it is attached exclusively to one skb.
> It must be destroyed with skb, if it has not been confirmed, so we
> don't need refcnt on this stage.
> 
> I found only one place, where a reference counter of unconfirmed
> conntract can incremented. It's ctnetlink_dump_table().

What about skb_clone, etc?  They will also increment the refcnt
if a conntrack entry is attached to the skb.
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