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=-3.9 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 D9445C65BAF for ; Sun, 9 Dec 2018 22:29:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AA21E2081F for ; Sun, 9 Dec 2018 22:29:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AA21E2081F 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 S1728910AbeLIW3D (ORCPT ); Sun, 9 Dec 2018 17:29:03 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:34574 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726327AbeLIVzK (ORCPT ); Sun, 9 Dec 2018 16:55:10 -0500 Received: from pub.yeoldevic.com ([81.174.156.145] helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gW72Y-0002ib-QL; Sun, 09 Dec 2018 21:55:06 +0000 Received: from ben by deadeye with local (Exim 4.91) (envelope-from ) id 1gW72X-0003CK-Qy; Sun, 09 Dec 2018 21:55:05 +0000 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, "linux-edac" , "Borislav Petkov" , "Johan Hovold" , "Mauro Carvalho Chehab" Date: Sun, 09 Dec 2018 21:50:33 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 003/328] EDAC, i7core: Fix memleaks and use-after-free on probe and remove In-Reply-To: X-SA-Exim-Connect-IP: 81.174.156.145 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 3.16.62-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 6c974d4dfafe5e9ee754f2a6fba0eb1864f1649e upstream. Make sure to free and deregister the addrmatch and chancounts devices allocated during probe in all error paths. Also fix use-after-free in a probe error path and in the remove success path where the devices were being put before before deregistration. Signed-off-by: Johan Hovold Cc: Mauro Carvalho Chehab Cc: linux-edac Fixes: 356f0a30860d ("i7core_edac: change the mem allocation scheme to make Documentation/kobject.txt happy") Link: http://lkml.kernel.org/r/20180612124335.6420-2-johan@kernel.org Signed-off-by: Borislav Petkov Signed-off-by: Ben Hutchings --- drivers/edac/i7core_edac.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) --- a/drivers/edac/i7core_edac.c +++ b/drivers/edac/i7core_edac.c @@ -1190,15 +1190,14 @@ static int i7core_create_sysfs_devices(s rc = device_add(pvt->addrmatch_dev); if (rc < 0) - return rc; + goto err_put_addrmatch; if (!pvt->is_registered) { pvt->chancounts_dev = kzalloc(sizeof(*pvt->chancounts_dev), GFP_KERNEL); if (!pvt->chancounts_dev) { - put_device(pvt->addrmatch_dev); - device_del(pvt->addrmatch_dev); - return -ENOMEM; + rc = -ENOMEM; + goto err_del_addrmatch; } pvt->chancounts_dev->type = &all_channel_counts_type; @@ -1212,9 +1211,18 @@ static int i7core_create_sysfs_devices(s rc = device_add(pvt->chancounts_dev); if (rc < 0) - return rc; + goto err_put_chancounts; } return 0; + +err_put_chancounts: + put_device(pvt->chancounts_dev); +err_del_addrmatch: + device_del(pvt->addrmatch_dev); +err_put_addrmatch: + put_device(pvt->addrmatch_dev); + + return rc; } static void i7core_delete_sysfs_devices(struct mem_ctl_info *mci) @@ -1229,11 +1237,11 @@ static void i7core_delete_sysfs_devices( device_remove_file(&mci->dev, &dev_attr_inject_enable); if (!pvt->is_registered) { - put_device(pvt->chancounts_dev); device_del(pvt->chancounts_dev); + put_device(pvt->chancounts_dev); } - put_device(pvt->addrmatch_dev); device_del(pvt->addrmatch_dev); + put_device(pvt->addrmatch_dev); } /****************************************************************************