netfilter: nf_tables: disallow jump to implicit chain from set element

stable inclusion
from stable-v5.10.140
commit 6301a73bd83d94b9b3eab8581adb04e40fb5f079
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I63FTT

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6301a73bd83d94b9b3eab8581adb04e40fb5f079

--------------------------------

[ Upstream commit f323ef3a ]

Extend struct nft_data_desc to add a flag field that specifies
nft_data_init() is being called for set element data.

Use it to disallow jump to implicit chain from set element, only jump
to chain via immediate expression is allowed.

Fixes: d0e2c7de ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

 Conflicts:
	net/netfilter/nf_tables_api.c
Reviewed-by: NWei Li <liwei391@huawei.com>

include/net/netfilter/nf_tables.h

@@ -176,10 +176,15 @@ struct nft_ctx {
 	bool				report;
 };
 
+enum nft_data_desc_flags {
+	NFT_DATA_DESC_SETELEM	= (1 << 0),
+};
+
 struct nft_data_desc {
 	enum nft_data_types		type;
 	unsigned int			size;
 	unsigned int			len;
+	unsigned int			flags;
 };
 
 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,

net/netfilter/nf_tables_api.c

@@ -4865,6 +4865,7 @@ static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
 	desc->type = dtype;
 	desc->size = NFT_DATA_VALUE_MAXLEN;
 	desc->len = set->dlen;
+	desc->flags = NFT_DATA_DESC_SETELEM;
 
 	return nft_data_init(ctx, data, desc, attr);
 }
@@ -8679,6 +8680,9 @@ static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
 			return -EOPNOTSUPP;
 		if (nft_chain_is_bound(chain))
 			return -EINVAL;
+		if (desc->flags & NFT_DATA_DESC_SETELEM &&
+		    chain->flags & NFT_CHAIN_BINDING)
+			return -EINVAL;
 
 		chain->use++;
 		data->verdict.chain = chain;