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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C53EEC4360F for ; Thu, 4 Apr 2019 09:10:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 950E220652 for ; Thu, 4 Apr 2019 09:10:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554369021; bh=1aocFFN7czNLmJgbsmMdpuvADc09IZYWEvWl5xCWgio=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pUg/+0WhWUNFP9vwNgqVjSIZpUfsV7JfgyNzD86j/0HH30KCVZITOwg5bRX/Li5+G lvKUp5PG1M4Ip0XX6EqeCtgpYhf9+yO6L9FcJY/o4Ux08aRiO1L3RhwL8yod52sAxA KBrAOocl0umh8A6Tfk48lVuPYCpFDH/b60/0O4cU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732994AbfDDJKU (ORCPT ); Thu, 4 Apr 2019 05:10:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:49818 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732982AbfDDJKP (ORCPT ); Thu, 4 Apr 2019 05:10:15 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 70A772075E; Thu, 4 Apr 2019 09:10:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554369014; bh=1aocFFN7czNLmJgbsmMdpuvADc09IZYWEvWl5xCWgio=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Dv3b4Lh1r1eoIPR2SGgSRQyBk1GekOLqugnxZlqJJ4nT7NIGViOzsh20Quww9rBvS ghwnP1rztIi35J71U729Vq9SR1v9WtFkm7XNH3IklWuAyafpuRufvceIC5cU76vJwe RuR8cie6oNj0bRX48bLAtgI1h9UBNdpTjdHUeLG8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , Zhang Yu , Li RongQing , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 5.0 049/246] netfilter: nf_tables: check the result of dereferencing base_chain->stats Date: Thu, 4 Apr 2019 10:45:49 +0200 Message-Id: <20190404084620.737945312@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190404084619.236418459@linuxfoundation.org> References: <20190404084619.236418459@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 5.0-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit a9f5e78c403d2d62ade4f4c85040efc85f4049b8 ] Check the result of dereferencing base_chain->stats, instead of result of this_cpu_ptr with NULL. base_chain->stats maybe be changed to NULL when a chain is updated and a new NULL counter can be attached. And we do not need to check returning of this_cpu_ptr since base_chain->stats is from percpu allocator if it is non-NULL, this_cpu_ptr returns a valid value. And fix two sparse error by replacing rcu_access_pointer and rcu_dereference with READ_ONCE under rcu_read_lock. Thanks for Eric's help to finish this patch. Fixes: 009240940e84c1 ("netfilter: nf_tables: don't assume chain stats are set when jumplabel is set") Signed-off-by: Eric Dumazet Signed-off-by: Zhang Yu Signed-off-by: Li RongQing Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nf_tables_core.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c index a50500232b0a..7e8dae82ca52 100644 --- a/net/netfilter/nf_tables_core.c +++ b/net/netfilter/nf_tables_core.c @@ -98,21 +98,23 @@ static noinline void nft_update_chain_stats(const struct nft_chain *chain, const struct nft_pktinfo *pkt) { struct nft_base_chain *base_chain; + struct nft_stats __percpu *pstats; struct nft_stats *stats; base_chain = nft_base_chain(chain); - if (!rcu_access_pointer(base_chain->stats)) - return; - local_bh_disable(); - stats = this_cpu_ptr(rcu_dereference(base_chain->stats)); - if (stats) { + rcu_read_lock(); + pstats = READ_ONCE(base_chain->stats); + if (pstats) { + local_bh_disable(); + stats = this_cpu_ptr(pstats); u64_stats_update_begin(&stats->syncp); stats->pkts++; stats->bytes += pkt->skb->len; u64_stats_update_end(&stats->syncp); + local_bh_enable(); } - local_bh_enable(); + rcu_read_unlock(); } struct nft_jumpstack { -- 2.19.1