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netfilter: nf_tables: disallow binding to already bound chain
[ Upstream commit e02f0d3 ] 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 <exsociety@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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