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=-6.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 D9CC0C43441 for ; Sun, 11 Nov 2018 23:39:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A158820818 for ; Sun, 11 Nov 2018 23:39:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="DNTa4HqY" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A158820818 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388040AbeKLITq (ORCPT ); Mon, 12 Nov 2018 03:19:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:42048 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387972AbeKLITq (ORCPT ); Mon, 12 Nov 2018 03:19:46 -0500 Received: from localhost (unknown [206.108.79.134]) (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 BE8B6223C6; Sun, 11 Nov 2018 22:29:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541975389; bh=1brLAD261fnXFqGpEzzCOyqcPuHa0a7Nba6vVJDh4fM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DNTa4HqYCqlhk00d6OJXa0eeOviLho1qSu442qYb0c/YZzPC1ZTiFN8L6x4NoQWqx 2j3X5mECkwLk9jSBalQk/yNePxMSKM5mbm6L4gfNW6Kjjb12tL2FulK0ryU6r5MZEw hvahJ+yT+Cj1hCrbK5PUZfaWBqLUM1zd/hpLGJOE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Serhey Popovych , "David S. Miller" , Sasha Levin Subject: [PATCH 4.18 071/350] tun: Consistently configure generic netdev params via rtnetlink Date: Sun, 11 Nov 2018 14:18:55 -0800 Message-Id: <20181111221710.108719521@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181111221707.043394111@linuxfoundation.org> References: <20181111221707.043394111@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review 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 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Serhey Popovych [ Upstream commit df52eab23d703142c766ac00bdb8db19d71238d0 ] Configuring generic network device parameters on tun will fail in presence of IFLA_INFO_KIND attribute in IFLA_LINKINFO nested attribute since tun_validate() always return failure. This can be visualized with following ip-link(8) command sequences: # ip link set dev tun0 group 100 # ip link set dev tun0 group 100 type tun RTNETLINK answers: Invalid argument with contrast to dummy and veth drivers: # ip link set dev dummy0 group 100 # ip link set dev dummy0 type dummy # ip link set dev veth0 group 100 # ip link set dev veth0 group 100 type veth Fix by returning zero in tun_validate() when @data is NULL that is always in case since rtnl_link_ops->maxtype is zero in tun driver. Fixes: f019a7a594d9 ("tun: Implement ip link del tunXXX") Signed-off-by: Serhey Popovych Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/net/tun.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -2304,6 +2304,8 @@ static void tun_setup(struct net_device static int tun_validate(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { + if (!data) + return 0; return -EINVAL; }