From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 02A24569D for ; Sun, 28 May 2023 19:26:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83D2BC433EF; Sun, 28 May 2023 19:26:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1685301976; bh=G4vI9UCc8ia5rsVYBUOB4i9tikUZWSpYNvl207i+JUc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qK31wEMDqLn5i7vxKFfsXqJItKoU5jUeXsgtOYv0Gjpm9bxLTg+7emmigVtJqzpLV 0dLbC+IBVB1s8phsZTqqYz7AOv6MLioDg/NCGk7eyj3r1IpKIe/QNTUnkdlFFBQEk2 jxNQX0OmKTMzT1H1zavxPZOkMFL5/lU5rhisaGrY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 5.4 112/161] netfilter: nf_tables: hold mutex on netns pre_exit path Date: Sun, 28 May 2023 20:10:36 +0100 Message-Id: <20230528190840.637411577@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230528190837.051205996@linuxfoundation.org> References: <20230528190837.051205996@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pablo Neira Ayuso [ 3923b1e4406680d57da7e873da77b1683035d83f ] clean_net() runs in workqueue while walking over the lists, grab mutex. Fixes: 767d1216bff8 ("netfilter: nftables: fix possible UAF over chains from packet path in netns") Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nf_tables_api.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index e4eef4947cc75..909076ef157e8 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -7866,7 +7866,9 @@ static int __net_init nf_tables_init_net(struct net *net) static void __net_exit nf_tables_pre_exit_net(struct net *net) { + mutex_lock(&net->nft.commit_mutex); __nft_release_hooks(net); + mutex_unlock(&net->nft.commit_mutex); } static void __net_exit nf_tables_exit_net(struct net *net) -- 2.39.2