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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 D8E3DC282DA for ; Sun, 3 Feb 2019 14:01:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A853120815 for ; Sun, 3 Feb 2019 14:01:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729112AbfBCOBV (ORCPT ); Sun, 3 Feb 2019 09:01:21 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:53212 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728085AbfBCNtt (ORCPT ); Sun, 3 Feb 2019 08:49:49 -0500 Received: from cable-78.29.236.164.coditel.net ([78.29.236.164] helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gqI9b-0003tt-0r; Sun, 03 Feb 2019 13:49:47 +0000 Received: from ben by deadeye with local (Exim 4.92-RC4) (envelope-from ) id 1gqI9X-0006w3-C4; Sun, 03 Feb 2019 14:49:43 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "David S. Miller" , "Serhey Popovych" Date: Sun, 03 Feb 2019 14:45:08 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 086/305] tun: Consistently configure generic netdev params via rtnetlink In-Reply-To: X-SA-Exim-Connect-IP: 78.29.236.164 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.63-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Serhey Popovych commit df52eab23d703142c766ac00bdb8db19d71238d0 upstream. 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: Ben Hutchings --- drivers/net/tun.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1415,6 +1415,8 @@ static void tun_setup(struct net_device */ static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) { + if (!data) + return 0; return -EINVAL; }