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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 F205AC43381 for ; Fri, 22 Mar 2019 11:21:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BF50E218D4 for ; Fri, 22 Mar 2019 11:21:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553253689; bh=3DWNh8B3dT9JMGBQwhA/Gyt+OsZArXQwo4yn6jEsgZs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fQ6pDgOvomP7pWrEr+u/jPn0IzIze5fWTw7SwY0gs7ETVL4mYHkCdQOqWxosIyHYD JaqUyYkDmYumi5aBaM9DD3DMJQhqxE1We8YCvixw/cF/obpfUx+9BLC2lWm+OFs2hq eT7k2gFIJBTizCXh/9/DsEY3XT0M1HY/FwY082fE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728598AbfCVLV2 (ORCPT ); Fri, 22 Mar 2019 07:21:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:47916 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728589AbfCVLVZ (ORCPT ); Fri, 22 Mar 2019 07:21:25 -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 17F5B218A2; Fri, 22 Mar 2019 11:21:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553253684; bh=3DWNh8B3dT9JMGBQwhA/Gyt+OsZArXQwo4yn6jEsgZs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=igdmA8WQBBoKR+FI8z8U6IKnWEjKX5Ie20rxCVMfHBqYs8W2BlrSbvMMA7ngwbry2 B24nN8sd6hxSfjHdyFTdaSE+i9MhCXw86vdm9M5ztNLCaYD8lD6yUJDR03fFV/H/bB gK8orez65lKwR9REVB+ajpzG44LD9FStgcUeOdv8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+4d4af685432dc0e56c91@syzkaller.appspotmail.com, syzbot+68ee510075cf64260cc4@syzkaller.appspotmail.com, Jiri Pirko , Paolo Abeni , Cong Wang , Jiri Pirko , "David S. Miller" Subject: [PATCH 3.18 022/134] team: avoid complex list operations in team_nl_cmd_options_set() Date: Fri, 22 Mar 2019 12:13:55 +0100 Message-Id: <20190322111211.482576285@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190322111210.465931067@linuxfoundation.org> References: <20190322111210.465931067@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 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cong Wang [ Upstream commit 2fdeee2549231b1f989f011bb18191f5660d3745 ] The current opt_inst_list operations inside team_nl_cmd_options_set() is too complex to track: LIST_HEAD(opt_inst_list); nla_for_each_nested(...) { list_for_each_entry(opt_inst, &team->option_inst_list, list) { if (__team_option_inst_tmp_find(&opt_inst_list, opt_inst)) continue; list_add(&opt_inst->tmp_list, &opt_inst_list); } } team_nl_send_event_options_get(team, &opt_inst_list); as while we retrieve 'opt_inst' from team->option_inst_list, it could be added to the local 'opt_inst_list' for multiple times. The __team_option_inst_tmp_find() doesn't work, as the setter team_mode_option_set() still calls team->ops.exit() which uses ->tmp_list too in __team_options_change_check(). Simplify the list operations by moving the 'opt_inst_list' and team_nl_send_event_options_get() into the nla_for_each_nested() loop so that it can be guranteed that we won't insert a same list entry for multiple times. Therefore, __team_option_inst_tmp_find() can be removed too. Fixes: 4fb0534fb7bb ("team: avoid adding twice the same option to the event list") Fixes: 2fcdb2c9e659 ("team: allow to send multiple set events in one message") Reported-by: syzbot+4d4af685432dc0e56c91@syzkaller.appspotmail.com Reported-by: syzbot+68ee510075cf64260cc4@syzkaller.appspotmail.com Cc: Jiri Pirko Cc: Paolo Abeni Signed-off-by: Cong Wang Acked-by: Jiri Pirko Reviewed-by: Paolo Abeni Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/team/team.c | 27 +++++---------------------- 1 file changed, 5 insertions(+), 22 deletions(-) --- a/drivers/net/team/team.c +++ b/drivers/net/team/team.c @@ -253,17 +253,6 @@ static void __team_option_inst_mark_remo } } -static bool __team_option_inst_tmp_find(const struct list_head *opts, - const struct team_option_inst *needle) -{ - struct team_option_inst *opt_inst; - - list_for_each_entry(opt_inst, opts, tmp_list) - if (opt_inst == needle) - return true; - return false; -} - static int __team_options_register(struct team *team, const struct team_option *option, size_t option_count) @@ -2435,7 +2424,6 @@ static int team_nl_cmd_options_set(struc int err = 0; int i; struct nlattr *nl_option; - LIST_HEAD(opt_inst_list); team = team_nl_team_get(info); if (!team) @@ -2451,6 +2439,7 @@ static int team_nl_cmd_options_set(struc struct nlattr *opt_attrs[TEAM_ATTR_OPTION_MAX + 1]; struct nlattr *attr; struct nlattr *attr_data; + LIST_HEAD(opt_inst_list); enum team_option_type opt_type; int opt_port_ifindex = 0; /* != 0 for per-port options */ u32 opt_array_index = 0; @@ -2554,23 +2543,17 @@ static int team_nl_cmd_options_set(struc if (err) goto team_put; opt_inst->changed = true; - - /* dumb/evil user-space can send us duplicate opt, - * keep only the last one - */ - if (__team_option_inst_tmp_find(&opt_inst_list, - opt_inst)) - continue; - list_add(&opt_inst->tmp_list, &opt_inst_list); } if (!opt_found) { err = -ENOENT; goto team_put; } - } - err = team_nl_send_event_options_get(team, &opt_inst_list); + err = team_nl_send_event_options_get(team, &opt_inst_list); + if (err) + break; + } team_put: team_nl_team_put(team);