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    Subject[PATCH 5.19 062/158] netfilter: nf_tables: disallow binding to already bound chain
    Date
    From: Pablo Neira Ayuso <pablo@netfilter.org>

    [ Upstream commit e02f0d3970404bfea385b6edb86f2d936db0ea2b ]

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

    Fixes: d0e2c7de92c7 ("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>
    ---
    net/netfilter/nf_tables_api.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
    index b2c89e8c2a655..bc690238a3c56 100644
    --- a/net/netfilter/nf_tables_api.c
    +++ b/net/netfilter/nf_tables_api.c
    @@ -9657,6 +9657,8 @@ 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;
    --
    2.35.1


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