netfilter: nft_dynset: disallow object maps

JIRA: https://issues.redhat.com/browse/RHEL-1720
JIRA: https://issues.redhat.com/browse/RHEL-1721
Upstream Status: commit 23185c6

commit 23185c6
Author: Pablo Neira Ayuso <pablo@netfilter.org>
Date:   Tue Aug 15 15:39:02 2023 +0200

    netfilter: nft_dynset: disallow object maps

    Do not allow to insert elements from datapath to objects maps.

    Fixes: 8aeff92 ("netfilter: nf_tables: add stateful object reference to set elements")
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
    Signed-off-by: Florian Westphal <fw@strlen.de>

Signed-off-by: Florian Westphal <fwestpha@redhat.com>

Author: fw-strlen

net/netfilter/nft_dynset.c

@@ -191,6 +191,9 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
 	if (IS_ERR(set))
 		return PTR_ERR(set);
 
+	if (set->flags & NFT_SET_OBJECT)
+		return -EOPNOTSUPP;
+
 	if (set->ops->update == NULL)
 		return -EOPNOTSUPP;