current/SOURCES/netfilter-nf_tables-disallow-updates-of-implicit-cha.patch

From 68d86ff6f56c33e6eb852f5b6a75af6dfc2e4470 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Sun, 21 Aug 2022 10:28:25 +0200
Subject: netfilter: nf_tables: disallow updates of implicit chain

From: Pablo Neira Ayuso <pablo@netfilter.org>

[ Upstream commit 5dc52d83baac30decf5f3b371d5eb41dfa1d1412 ]

Updates on existing implicit chain make no sense, disallow this.

Fixes: d0e2c7de92c7 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/netfilter/nf_tables_api.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 4bd6e9427c918..8b6ee9df817fb 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2574,6 +2574,9 @@ static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
        nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
 
        if (chain != NULL) {
+               if (chain->flags & NFT_CHAIN_BINDING)
+                       return -EINVAL;
+
                if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
                        NL_SET_BAD_ATTR(extack, attr);
                        return -EEXIST;
-- 
2.35.1

1	From 68d86ff6f56c33e6eb852f5b6a75af6dfc2e4470 Mon Sep 17 00:00:00 2001
2	From: Sasha Levin <sashal@kernel.org>
3	Date: Sun, 21 Aug 2022 10:28:25 +0200
4	Subject: netfilter: nf_tables: disallow updates of implicit chain
5
6	From: Pablo Neira Ayuso <pablo@netfilter.org>
7
8	[ Upstream commit 5dc52d83baac30decf5f3b371d5eb41dfa1d1412 ]
9
10	Updates on existing implicit chain make no sense, disallow this.
11
12	Fixes: d0e2c7de92c7 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
13	Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
14	Signed-off-by: Sasha Levin <sashal@kernel.org>
15	---
16	net/netfilter/nf_tables_api.c \| 3 +++
17	1 file changed, 3 insertions(+)
18
19	diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
20	index 4bd6e9427c918..8b6ee9df817fb 100644
21	--- a/net/netfilter/nf_tables_api.c
22	+++ b/net/netfilter/nf_tables_api.c
23	@@ -2574,6 +2574,9 @@ static int nf_tables_newchain(struct sk_buff skb, const struct nfnl_info info,
24	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
25
26	if (chain != NULL) {
27	+ if (chain->flags & NFT_CHAIN_BINDING)
28	+ return -EINVAL;
29	+
30	if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
31	NL_SET_BAD_ATTR(extack, attr);
32	return -EEXIST;
33	--
34	2.35.1
35