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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2023-07-23 16:41:48 +0200 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2023-07-26 16:48:49 +0200 |
| commit | 0ebc1064e4874d5987722a2ddbc18f94aa53b211 (patch) | |
| tree | ea19306a3e56bac6b91a0ed63b62bc2a490cb37b /net | |
| parent | 0a771f7b266b02d262900c75f1e175c7fe76fec2 (diff) | |
| download | lwn-0ebc1064e4874d5987722a2ddbc18f94aa53b211.tar.gz lwn-0ebc1064e4874d5987722a2ddbc18f94aa53b211.zip | |
netfilter: nf_tables: disallow rule addition to bound chain via NFTA_RULE_CHAIN_ID
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]
Fixes: d0e2c7de92c7 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Reported-by: Kevin Rich <kevinrich1337@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index b9a4d3fd1d34..d3c6ecd1f5a6 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3811,8 +3811,6 @@ 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], @@ -3825,6 +3823,9 @@ 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); |