From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D38D0CD484A for ; Fri, 22 Sep 2023 17:01:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232808AbjIVRBg (ORCPT ); Fri, 22 Sep 2023 13:01:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232707AbjIVRBf (ORCPT ); Fri, 22 Sep 2023 13:01:35 -0400 Received: from mail.netfilter.org (mail.netfilter.org [217.70.188.207]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5C92C1A6; Fri, 22 Sep 2023 10:01:29 -0700 (PDT) From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: gregkh@linuxfoundation.org, stable@vger.kernel.org, sashal@kernel.org Subject: [PATCH -stable,5.10 09/17] netfilter: nf_tables: GC transaction race with netns dismantle Date: Fri, 22 Sep 2023 19:01:10 +0200 Message-Id: <20230922170118.152420-10-pablo@netfilter.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230922170118.152420-1-pablo@netfilter.org> References: <20230922170118.152420-1-pablo@netfilter.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org 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 Signed-off-by: Florian Westphal --- 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 43da2f0a5262..78bf82f89ecd 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -8089,9 +8089,14 @@ 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