netfilter: nf_tables: validate family when identifying table via handle

Validate table family when looking up for it via NFTA_TABLE_HANDLE.

Fixes: 3ecbfd65 ("netfilter: nf_tables: allocate handle and delete objects via handle")
Reported-by: Xingyuan Mo <hdthky0@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_tables_api.c

@@ -803,7 +803,7 @@ static struct nft_table *nft_table_lookup(const struct net *net,
 
 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 						   const struct nlattr *nla,
-						   u8 genmask, u32 nlpid)
+						   int family, u8 genmask, u32 nlpid)
 {
 	struct nftables_pernet *nft_net;
 	struct nft_table *table;
@@ -811,6 +811,7 @@ static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 	nft_net = nft_pernet(net);
 	list_for_each_entry(table, &nft_net->tables, list) {
 		if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
+		    table->family == family &&
 		    nft_active_genmask(table, genmask)) {
 			if (nft_table_has_owner(table) &&
 			    nlpid && table->nlpid != nlpid)
@@ -1544,7 +1545,7 @@ static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
 
 	if (nla[NFTA_TABLE_HANDLE]) {
 		attr = nla[NFTA_TABLE_HANDLE];
-		table = nft_table_lookup_byhandle(net, attr, genmask,
+		table = nft_table_lookup_byhandle(net, attr, family, genmask,
 						  NETLINK_CB(skb).portid);
 	} else {
 		attr = nla[NFTA_TABLE_NAME];