[PATCH 6.6.y 2/2] netfilter: nf_tables: join hook list via splice_list_rcu() in commit phase
From: Benjamin Robin (Schneider Electric)
Date: Fri Sep 25 2026 - 04:14:22 EST
From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
[ Upstream commit a6134e62dba2ea4f760b29d5226907f447c92400 ]
Publish new hooks in the list into the basechain/flowtable using
splice_list_rcu() to ensure netlink dump list traversal via rcu is safe
while concurrent ruleset update is going on.
Fixes: 78d9f48f7f44 ("netfilter: nf_tables: add devices to existing flowtable")
Fixes: b9703ed44ffb ("netfilter: nf_tables: support for adding new devices to an existing netdev chain")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/netfilter/nf_tables_api.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index a9053667e370..a1c701886fc1 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -10298,8 +10298,8 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
nft_chain_commit_update(trans);
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
&nft_trans_chain_hooks(trans));
- list_splice(&nft_trans_chain_hooks(trans),
- &nft_trans_basechain(trans)->hook_list);
+ list_splice_rcu(&nft_trans_chain_hooks(trans),
+ &nft_trans_basechain(trans)->hook_list);
/* trans destroyed after rcu grace period */
} else {
nft_chain_commit_drop_policy(trans);
@@ -10439,8 +10439,8 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
nft_trans_flowtable(trans),
&nft_trans_flowtable_hooks(trans),
NFT_MSG_NEWFLOWTABLE);
- list_splice(&nft_trans_flowtable_hooks(trans),
- &nft_trans_flowtable(trans)->hook_list);
+ list_splice_rcu(&nft_trans_flowtable_hooks(trans),
+ &nft_trans_flowtable(trans)->hook_list);
} else {
nft_clear(net, nft_trans_flowtable(trans));
nf_tables_flowtable_notify(&trans->ctx,
--
2.55.0