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netfilter: nf_tables: disallow updates of implicit chain

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Updates on existing implicit chain make no sense, disallow this.

Fixes: d0e2c7de92 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2022-08-21 10:28:25 +02:00
parent 18bbc32133
commit 5dc52d83ba
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nf_tables_api.c
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@ -2574,6 +2574,9 @@ static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
if (chain != NULL) {
if (chain->flags & NFT_CHAIN_BINDING)
return -EINVAL;
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;