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=-5.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,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 B2CE0C65C22 for ; Fri, 2 Nov 2018 18:45:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8557820837 for ; Fri, 2 Nov 2018 18:45:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="q13EsE6q" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8557820837 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 S1730286AbeKCDyF (ORCPT ); Fri, 2 Nov 2018 23:54:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:49840 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729310AbeKCDyE (ORCPT ); Fri, 2 Nov 2018 23:54:04 -0400 Received: from localhost (5356596B.cm-6-7b.dynamic.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 58C242084A; Fri, 2 Nov 2018 18:45:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541184351; bh=qg8CpU78lH1OilsKxYb0PS/ZE73p/XI5xnpHgUtWS7c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q13EsE6qPUqYEqB2U1aWLR4EKonFDICe0OgJHExz3V0QJm3RikmTRSBXd+Mt75Pa6 8IMk23Sy9lnCZrPqY11oT1XIefbB9WYm58SR89JPtc5Qz4Qp/cZl8edaM1ac23dJHw WxVzzd8b5fTpf/+wUSXBuC+Wwfux/7yho9ZAG77U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Shalom Toledo , Jiri Pirko , Ido Schimmel , "David S. Miller" Subject: [PATCH 4.18 141/150] mlxsw: core: Fix devlink unregister flow Date: Fri, 2 Nov 2018 19:35:03 +0100 Message-Id: <20181102182912.333978872@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181102182902.250560510@linuxfoundation.org> References: <20181102182902.250560510@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: Shalom Toledo [ Upstream commit a22712a962912faf257e857ab6857f56a93cfb34 ] After a failed reload, the driver is still registered to devlink, its devlink instance is still allocated and the 'reload_fail' flag is set. Then, in the next reload try, the driver's allocated devlink instance will be freed without unregistering from devlink and its components (e.g, resources). This scenario can cause a use-after-free if the user tries to execute command via devlink user-space tool. Fix by not freeing the devlink instance during reload (failed or not). Fixes: 24cc68ad6c46 ("mlxsw: core: Add support for reload") Signed-off-by: Shalom Toledo Reviewed-by: Jiri Pirko Signed-off-by: Ido Schimmel Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/mellanox/mlxsw/core.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) --- a/drivers/net/ethernet/mellanox/mlxsw/core.c +++ b/drivers/net/ethernet/mellanox/mlxsw/core.c @@ -985,8 +985,8 @@ static int mlxsw_devlink_core_bus_device mlxsw_core->bus, mlxsw_core->bus_priv, true, devlink); - if (err) - mlxsw_core->reload_fail = true; + mlxsw_core->reload_fail = !!err; + return err; } @@ -1126,8 +1126,15 @@ void mlxsw_core_bus_device_unregister(st const char *device_kind = mlxsw_core->bus_info->device_kind; struct devlink *devlink = priv_to_devlink(mlxsw_core); - if (mlxsw_core->reload_fail) - goto reload_fail; + if (mlxsw_core->reload_fail) { + if (!reload) + /* Only the parts that were not de-initialized in the + * failed reload attempt need to be de-initialized. + */ + goto reload_fail_deinit; + else + return; + } if (mlxsw_core->driver->fini) mlxsw_core->driver->fini(mlxsw_core); @@ -1140,9 +1147,12 @@ void mlxsw_core_bus_device_unregister(st if (!reload) devlink_resources_unregister(devlink, NULL); mlxsw_core->bus->fini(mlxsw_core->bus_priv); - if (reload) - return; -reload_fail: + + return; + +reload_fail_deinit: + devlink_unregister(devlink); + devlink_resources_unregister(devlink, NULL); devlink_free(devlink); mlxsw_core_driver_put(device_kind); }