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CVE-2022-39190: netfilter: nf_tables: disallow binding to already bound chain · torvalds/linux@e02f0d3

An issue was discovered in net/netfilter/nf_tables_api.c in the Linux kernel before 5.19.6. A denial of service can occur upon binding to an already bound chain.

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netfilter: nf_tables: disallow binding to already bound chain

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

Fixes: d0e2c7d (“netfilter: nf_tables: add NFT_CHAIN_BINDING”) Reported-by: Gwangun Jung [email protected] Signed-off-by: Pablo Neira Ayuso [email protected]

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1 parent 01e4092 commit e02f0d3970404bfea385b6edb86f2d936db0ea2b

Showing 1 changed file with 2 additions and 0 deletions.

@@ -9711,6 +9711,8 @@ 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;

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