From: Pablo Neira Ayuso pablo@netfilter.org
stable inclusion from stable-v5.10.188 commit 237f37f7b9f075c34bf0468c390cdd7e2725d8b0 bugzilla: https://gitee.com/openeuler/kernel/issues/I86JB6
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ 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: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Lu Wei luwei32@huawei.com --- 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 77222e03d3cc..319480323274 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -360,6 +360,11 @@ static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *tr if (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); @@ -8041,6 +8046,14 @@ 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; } }