From c603880bd51d72fb75172c41405fba349db8d8ad Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sun, 23 Jul 2023 16:41:48 +0200 Subject: [PATCH] UPSTREAM: netfilter: nf_tables: disallow rule addition to bound chain via NFTA_RULE_CHAIN_ID [ Upstream commit 0ebc1064e4874d5987722a2ddbc18f94aa53b211 ] Bail out with EOPNOTSUPP when adding rule to bound chain via NFTA_RULE_CHAIN_ID. The following warning splat is shown when adding a rule to a deleted bound chain: WARNING: CPU: 2 PID: 13692 at net/netfilter/nf_tables_api.c:2013 nf_tables_chain_destroy+0x1f7/0x210 [nf_tables] CPU: 2 PID: 13692 Comm: chain-bound-rul Not tainted 6.1.39 #1 RIP: 0010:nf_tables_chain_destroy+0x1f7/0x210 [nf_tables] Bug: 296128351 Fixes: d0e2c7de92c7 ("netfilter: nf_tables: add NFT_CHAIN_BINDING") Reported-by: Kevin Rich Signed-off-by: Pablo Neira Ayuso Signed-off-by: Florian Westphal Signed-off-by: Sasha Levin (cherry picked from commit 268cb07ef3ee17b5454a7c4b23376802c5b00c79) Signed-off-by: Lee Jones Change-Id: Icf97f57d18bb2b30ed28a3de6cdd18661d7f1c3d --- net/netfilter/nf_tables_api.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index ea2216826e11..ed73d8585e6e 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3533,8 +3533,6 @@ static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info, NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); return PTR_ERR(chain); } - if (nft_chain_is_bound(chain)) - return -EOPNOTSUPP; } else if (nla[NFTA_RULE_CHAIN_ID]) { chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]); @@ -3546,6 +3544,9 @@ static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info, return -EINVAL; } + if (nft_chain_is_bound(chain)) + return -EOPNOTSUPP; + if (nla[NFTA_RULE_HANDLE]) { handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); rule = __nft_rule_lookup(chain, handle);