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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,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 C4BD2C433E0 for ; Mon, 18 Jan 2021 11:49:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 737EA2065C for ; Mon, 18 Jan 2021 11:49:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390834AbhARLtZ (ORCPT ); Mon, 18 Jan 2021 06:49:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:41298 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390933AbhARLqw (ORCPT ); Mon, 18 Jan 2021 06:46:52 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 362B222D03; Mon, 18 Jan 2021 11:46:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1610970368; bh=tRxNm3LXsTUpVuhOMwtQp2O0gJkpnWmS85us2GCQWAQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jZ/UKv3HP+DHtuVSlZiLx4UdKyf1slA2Llc/3jvmUqSR7zo2nwt18PFrkYyuHd26C bMT/9fedw059zQ3/GkKKYtzp6ovip/B3gAmkb9uHjEHRhk+vgPBywYxy+CCuHsRCwH P2A8d0o/pbTL2oeq1sp/aiSH2Wt99C1Skf7hPUlQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yoel Caspersen , Jesper Dangaard Brouer , Florian Westphal , Pablo Neira Ayuso Subject: [PATCH 5.10 151/152] netfilter: conntrack: fix reading nf_conntrack_buckets Date: Mon, 18 Jan 2021 12:35:26 +0100 Message-Id: <20210118113359.963988470@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210118113352.764293297@linuxfoundation.org> References: <20210118113352.764293297@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jesper Dangaard Brouer commit f6351c3f1c27c80535d76cac2299aec44c36291e upstream. The old way of changing the conntrack hashsize runtime was through changing the module param via file /sys/module/nf_conntrack/parameters/hashsize. This was extended to sysctl change in commit 3183ab8997a4 ("netfilter: conntrack: allow increasing bucket size via sysctl too"). The commit introduced second "user" variable nf_conntrack_htable_size_user which shadow actual variable nf_conntrack_htable_size. When hashsize is changed via module param this "user" variable isn't updated. This results in sysctl net/netfilter/nf_conntrack_buckets shows the wrong value when users update via the old way. This patch fix the issue by always updating "user" variable when reading the proc file. This will take care of changes to the actual variable without sysctl need to be aware. Fixes: 3183ab8997a4 ("netfilter: conntrack: allow increasing bucket size via sysctl too") Reported-by: Yoel Caspersen Signed-off-by: Jesper Dangaard Brouer Acked-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/netfilter/nf_conntrack_standalone.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -523,6 +523,9 @@ nf_conntrack_hash_sysctl(struct ctl_tabl { int ret; + /* module_param hashsize could have changed value */ + nf_conntrack_htable_size_user = nf_conntrack_htable_size; + ret = proc_dointvec(table, write, buffer, lenp, ppos); if (ret < 0 || !write) return ret;