netfilter: nf_tables: hold mutex on netns pre_exit path
[ 3923b1e4 ] clean_net() runs in workqueue while walking over the lists, grab mutex. Fixes: 767d1216 ("netfilter: nftables: fix possible UAF over chains from packet path in netns") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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6236af69
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