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 31A83CE79D7 for ; Wed, 20 Sep 2023 12:48:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235385AbjITMsf (ORCPT ); Wed, 20 Sep 2023 08:48:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235433AbjITMsd (ORCPT ); Wed, 20 Sep 2023 08:48:33 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C49692 for ; Wed, 20 Sep 2023 05:48:27 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66F9AC433C7; Wed, 20 Sep 2023 12:48:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695214106; bh=PBH2+t77/J6fFOpcLTlJuSBxscv72kNgX6et6mJ8spU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L++DDIOZvPf6WWZdOJx+78z6z/vJsIzUzXTf6CCVbvnE2RORidMmS474RadLb+b2r xJWGwLSqsCL6s1O+o7XTu4dp4px147ogR5/7RROX605/zvPlEbS4/FSv0zYPNCfLNX vsGB+0DfjBXnSokJojR6Z/Y51jtLqrk8ZRDncPsE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pablo Neira Ayuso , Florian Westphal , Sasha Levin Subject: [PATCH 5.15 089/110] netfilter: nf_tables: GC transaction race with netns dismantle Date: Wed, 20 Sep 2023 13:32:27 +0200 Message-ID: <20230920112833.748584828@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112830.377666128@linuxfoundation.org> References: <20230920112830.377666128@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pablo Neira Ayuso [ Upstream commit 02c6c24402bf1c1e986899c14ba22a10b510916b ] 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 Signed-off-by: Sasha Levin --- 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 3e17d2403d899..33023b42698bb 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -8944,9 +8944,14 @@ 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; -- 2.40.1