netfilter: flowtable: hold reference on ct until flow is released

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nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe
semantics also allow to refer to the wrong conntrack from the flowtable
datapath. Hold reference on ct until flow is released after rcu grace
period.

Add rcu_barrier() on module exit path, to ensure pending flow entries
are release before module goes away.

Fixes: 0ff90b6c20 ("netfilter: nf_flow_offload: fix use-after-free and a resource leak")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Pablo Neira Ayuso 2026-09-07 21:04:05 +02:00

parent cbdd39ce42

commit e75a9fa1d4

1 changed files with 10 additions and 2 deletions

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net/netfilter/nf_flow_table_core.c

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