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netfilter: nf_tables: disallow binding to already bound chain

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[ Upstream commit e02f0d3970 ]

Update nft_data_init() to report EINVAL if chain is already bound.

Fixes: d0e2c7de92 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Reported-by: Gwangun Jung <exsociety@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso
2022-08-22 11:06:39 +02:00
committed by Greg Kroah-Hartman
parent 6301a73bd8
commit c08a104a8b
1 changed files with 2 additions and 0 deletions
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2
net/netfilter/nf_tables_api.c
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@@ -8678,6 +8678,8 @@ static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
return PTR_ERR(chain);
if (nft_is_base_chain(chain))
return -EOPNOTSUPP;
if (nft_chain_is_bound(chain))
return -EINVAL;
if (desc->flags & NFT_DATA_DESC_SETELEM &&
chain->flags & NFT_CHAIN_BINDING)
return -EINVAL;