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netfilter: ipset: Add list flush to cancel_gc

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[ Upstream commit c1193d9bbbd379defe9be3c6de566de684de8a6f ]

Flushing list in cancel_gc drops references to other lists right away,
without waiting for RCU to destroy list. Fixes race when referenced
ipsets can't be destroyed while referring list is scheduled for destroy.

Fixes: 97f7cf1cd80e ("netfilter: ipset: fix performance regression in swap operation")
Signed-off-by: Alexander Maltsev <keltar.gw@gmail.com>
Acked-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Maltsev 2024-04-17 18:51:41 +05:00 • committed by Greg Kroah-Hartman
parent 33e0f0e51e
commit 4440ef0f58
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/ipset/ip_set_list_set.c
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@ -547,6 +547,9 @@ list_set_cancel_gc(struct ip_set *set)
if (SET_WITH_TIMEOUT(set))
del_timer_sync(&map->gc);
/* Flush list to drop references to other ipsets */
list_set_flush(set);
}
static const struct ip_set_type_variant set_variant = {