Trigger a warning if nf_ct_set() overlaps an existing ct object leading
to refcount leak. Add this warning to skb_set_nfct() whose only user is
nf_ct_set() instead.
Update existing nf_ct_set() callers to use nf_reset_ct() first to clean
up stale pointer to conntrack object which migh trigger false positive
warnings.
Reviewed-by: Fernando Fernandez Mancera <fmancera@suse.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5546b082fa