From: Pablo Neira Ayuso pablo@netfilter.org
[ Upstream commit 62e1e94b246e685d89c3163aaef4b160e42ceb02 ]
Use binding list to track set transaction and to check for unbound chains before entering the commit phase.
Bail out if chain binding remain unused before entering the commit step.
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 | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index c0126aac035f8..984720964a498 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -372,6 +372,11 @@ static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *tr nft_set_is_anonymous(nft_trans_set(trans))) list_add_tail(&trans->binding_list, &nft_net->binding_list); break; + case NFT_MSG_NEWCHAIN: + if (!nft_trans_chain_update(trans) && + nft_chain_binding(nft_trans_chain(trans))) + list_add_tail(&trans->binding_list, &nft_net->binding_list); + break; }
list_add_tail(&trans->list, &nft_net->commit_list); @@ -9221,6 +9226,14 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb) return -EINVAL; } break; + case NFT_MSG_NEWCHAIN: + if (!nft_trans_chain_update(trans) && + nft_chain_binding(nft_trans_chain(trans)) && + !nft_trans_chain_bound(trans)) { + pr_warn_once("nftables ruleset with unbound chain\n"); + return -EINVAL; + } + break; } }