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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 BF681C71122 for ; Sun, 14 Oct 2018 15:58:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E9DF20645 for ; Sun, 14 Oct 2018 15:58:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8E9DF20645 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=decadent.org.uk 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 S1728054AbeJNXkJ (ORCPT ); Sun, 14 Oct 2018 19:40:09 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:35921 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727481AbeJNXLv (ORCPT ); Sun, 14 Oct 2018 19:11:51 -0400 Received: from [2a02:8011:400e:2:cbab:f00:c93f:614] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1gBiLe-0004cY-SB; Sun, 14 Oct 2018 16:30:31 +0100 Received: from ben by deadeye with local (Exim 4.91) (envelope-from ) id 1gBiLb-0000ko-5t; Sun, 14 Oct 2018 16:30:27 +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 Date: Sun, 14 Oct 2018 16:25:41 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 352/366] ppp: Fix null pointer dereference on registration failure In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:cbab:f00:c93f:614 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 3.16.60-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Ben Hutchings register_netdevice() will call the device's ndo_uninit operation if registration fails after it calls the ndo_init operation. However ppp_dev_uninit() uses ppp->ppp_net which is currently not set until after register_netdevice() returns. This was fixed upstream as part of commit 6d934c70db6e "ppp: add rtnetlink device creation support". Signed-off-by: Ben Hutchings --- --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -2732,6 +2732,7 @@ static struct ppp *ppp_create_interface( ppp = netdev_priv(dev); ppp->dev = dev; + ppp->ppp_net = net; ppp->mru = PPP_MRU; init_ppp_file(&ppp->file, INTERFACE); ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */ @@ -2801,8 +2802,6 @@ static struct ppp *ppp_create_interface( goto out2; } - ppp->ppp_net = net; - atomic_inc(&ppp_unit_count); mutex_unlock(&pn->all_ppp_mutex); rtnl_unlock();