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netfilter: nf_tables: Keep deleted flowtable hooks until after RCU 

[ Upstream commit 642c89c475419b4d0c0d90e29d9c1a0e4351f379 ]

Documentation of list_del_rcu() warns callers to not immediately free
the deleted list item. While it seems not necessary to use the
RCU-variant of list_del() here in the first place, doing so seems to
require calling kfree_rcu() on the deleted item as well.

Fixes: 3f0465a9ef ("netfilter: nf_tables: dynamically allocate hooks per net_device in flowtables")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Phil Sutter 2024-09-12 14:21:33 +02:00 committed by Greg Kroah-Hartman
parent 3e8ac2743d
commit 668f4df6d6
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_tables_api.c
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@ -8943,7 +8943,7 @@ static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
FLOW_BLOCK_UNBIND);
list_del_rcu(&hook->list);
kfree(hook);
kfree_rcu(hook, rcu);
}
kfree(flowtable->name);
module_put(flowtable->data.type->owner);