netfilter: nf_tables: reject NFT_SET_CONCAT with not field length description
It is still possible to set on the NFT_SET_CONCAT flag by specifying a set size and no field description, report EINVAL in such case. Fixes: 1b6345d4 ("netfilter: nf_tables: check NFT_SET_CONCAT flag if field_count is specified") Signed-off-by:Pablo Neira Ayuso <pablo@netfilter.org>
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