From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Subject: [PATCH nf 2/3] netfilter: nf_tables: GC transaction race with netns dismantle
Date: Tue, 15 Aug 2023 15:39:01 +0200 [thread overview]
Message-ID: <20230815133902.65242-2-pablo@netfilter.org> (raw)
In-Reply-To: <20230815133902.65242-1-pablo@netfilter.org>
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>
---
net/netfilter/nf_tables_api.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index eed690dd1796..06c73aed149d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -9480,9 +9480,14 @@ 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;
--
2.30.2
next prev parent reply other threads:[~2023-08-15 13:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-15 13:39 [PATCH nf 1/3] netfilter: nf_tables: fix GC transaction races with netns and netlink event exit path Pablo Neira Ayuso
2023-08-15 13:39 ` Pablo Neira Ayuso [this message]
2023-08-15 13:39 ` [PATCH nf 3/3] netfilter: nft_dynset: disallow object maps Pablo Neira Ayuso
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