From patchwork Thu Oct 29 14:53:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eelco Chaudron X-Patchwork-Id: 11866575 X-Patchwork-Delegate: kuba@kernel.org 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=-9.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 50412C2D0A3 for ; Thu, 29 Oct 2020 14:53:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2615206D4 for ; Thu, 29 Oct 2020 14:53:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="F4C95iZ2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727855AbgJ2Oxe (ORCPT ); Thu, 29 Oct 2020 10:53:34 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:59933 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725782AbgJ2Oxe (ORCPT ); Thu, 29 Oct 2020 10:53:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1603983213; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=WuSaw54N2WNnWs+yiS2iuACMZJVkFJJ9zkoidtfL5A0=; b=F4C95iZ2AtVJnfN2Mv1PseSqYLkWWgyRLh4bwAWUI7WHTBKwucX1KnFqu4Gok1l5VBHlM6 MBxdoAJZm5V/VxHGIyU4vyyg8JATjOwBNCIdwTqmVdC8+KJKpOZXuo+lBLu/fa4vilXsrd Dk/8wna3nNv6Rg5OgHhHTiyOswM1Wp8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-543-SMNuPuw6OKaAqFD8S8cXEA-1; Thu, 29 Oct 2020 10:53:28 -0400 X-MC-Unique: SMNuPuw6OKaAqFD8S8cXEA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5B839939C1A; Thu, 29 Oct 2020 14:53:27 +0000 (UTC) Received: from ebuild.redhat.com (ovpn-114-253.ams2.redhat.com [10.36.114.253]) by smtp.corp.redhat.com (Postfix) with ESMTP id 526855B4A4; Thu, 29 Oct 2020 14:53:26 +0000 (UTC) From: Eelco Chaudron To: netdev@vger.kernel.org Cc: davem@davemloft.net, dev@openvswitch.org, kuba@kernel.org Subject: [PATCH net] net: openvswitch: silence suspicious RCU usage warning Date: Thu, 29 Oct 2020 15:53:21 +0100 Message-Id: <160398318667.8898.856205445259063348.stgit@ebuild> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Silence suspicious RCU usage warning in ovs_flow_tbl_masks_cache_resize() by replacing rcu_dereference() with rcu_dereference_ovsl(). In addition, when creating a new datapath, make sure it's configured under the ovs_lock. Fixes: 9bf24f594c6a ("net: openvswitch: make masks cache size configurable") Reported-by: syzbot+9a8f8bfcc56e8578016c@syzkaller.appspotmail.com Signed-off-by: Eelco Chaudron --- net/openvswitch/datapath.c | 8 ++++---- net/openvswitch/flow_table.c | 2 +- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index 832f898edb6a..020f8539fede 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -1695,6 +1695,9 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) if (err) goto err_destroy_ports; + /* So far only local changes have been made, now need the lock. */ + ovs_lock(); + /* Set up our datapath device. */ parms.name = nla_data(a[OVS_DP_ATTR_NAME]); parms.type = OVS_VPORT_TYPE_INTERNAL; @@ -1707,9 +1710,6 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) if (err) goto err_destroy_meters; - /* So far only local changes have been made, now need the lock. */ - ovs_lock(); - vport = new_vport(&parms); if (IS_ERR(vport)) { err = PTR_ERR(vport); @@ -1725,7 +1725,6 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) ovs_dp_reset_user_features(skb, info); } - ovs_unlock(); goto err_destroy_meters; } @@ -1742,6 +1741,7 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) return 0; err_destroy_meters: + ovs_unlock(); ovs_meters_exit(dp); err_destroy_ports: kfree(dp->ports); diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c index f3486a37361a..c89c8da99f1a 100644 --- a/net/openvswitch/flow_table.c +++ b/net/openvswitch/flow_table.c @@ -390,7 +390,7 @@ static struct mask_cache *tbl_mask_cache_alloc(u32 size) } int ovs_flow_tbl_masks_cache_resize(struct flow_table *table, u32 size) { - struct mask_cache *mc = rcu_dereference(table->mask_cache); + struct mask_cache *mc = rcu_dereference_ovsl(table->mask_cache); struct mask_cache *new; if (size == mc->cache_size)