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netfilter: nf_tables: GC transaction race with netns dismantle

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commit 02c6c24402bf1c1e986899c14ba22a10b510916b upstream.

Use maybe_get_net() since GC workqueue might race with netns exit path.

Fixes: 5f68718b34a5 ("netfilter: nf_tables: GC transaction API to avoid race with control plane")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso 2023-09-22 18:30:20 +02:00 • committed by Greg Kroah-Hartman
parent 41113aa569
commit afa584c350
1 changed files with 6 additions and 1 deletions
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7
net/netfilter/nf_tables_api.c
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@ -9155,9 +9155,14 @@ struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
if (!trans)
return NULL;
trans->net = maybe_get_net(net);
if (!trans->net) {
kfree(trans);
return NULL;
}
refcount_inc(&set->refs);
trans->set = set;
trans->net = get_net(net);
trans->seq = gc_seq;
return trans;