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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 94A5AC606BD for ; Mon, 8 Jul 2019 15:35:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6A3E020665 for ; Mon, 8 Jul 2019 15:35:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562600103; bh=jOGAo5Kf6rRcDT4LicwRH4ehDO0TFEjE18kYIJhuJN0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=TaJahQc6qADTltR29j5f5BJAUtGw7BN6nNQbYxMCpFstEUaQ5cTw46MlDiI27TAdy ymkqhRZm6pkUcO6BUl1Xp6NWt5kevFYtiMpo7F6+CEaSCl1QHUfMO5PBE9XrFXN8QS cjeRH85CiC1Syu6UPSJd5lZBGYubuy54uFJrrPBs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390873AbfGHPfC (ORCPT ); Mon, 8 Jul 2019 11:35:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:37172 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390618AbfGHPes (ORCPT ); Mon, 8 Jul 2019 11:34:48 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 5F18B204EC; Mon, 8 Jul 2019 15:34:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562600086; bh=jOGAo5Kf6rRcDT4LicwRH4ehDO0TFEjE18kYIJhuJN0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TEiaGyBTDWF1Z4qLtzxywUmmetxWC1q5nZscYRmlGutiN1zoYjXk8JopjaDonPnoF V5slMUdo/NwfNwfxRoG56KimSfrd9PRKCK8Irco/NNnJnsOVyybB4tYFjfD4AMgKJ8 NEHhkiZqTdIg1DNNmqmPf5q+rq9Z9QiI/SSNFbpA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vadim Pasternak , Andy Shevchenko , Sasha Levin Subject: [PATCH 5.1 47/96] platform/mellanox: mlxreg-hotplug: Add devm_free_irq call to remove flow Date: Mon, 8 Jul 2019 17:13:19 +0200 Message-Id: <20190708150529.065200329@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190708150526.234572443@linuxfoundation.org> References: <20190708150526.234572443@linuxfoundation.org> User-Agent: quilt/0.66 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 [ Upstream commit 8c2eb7b6468ad4aa5600aed01aa0715f921a3f8b ] Add devm_free_irq() call to mlxreg-hotplug remove() for clean release of devices irq resource. Fix debugobjects warning triggered by rmmod It prevents of use-after-free memory, related to mlxreg_hotplug_work_handler. Issue has been reported as debugobjects warning triggered by 'rmmod mlxtreg-hotplug' flow, while running kernel with CONFIG_DEBUG_OBJECTS* options. [ 2489.623551] ODEBUG: free active (active state 0) object type: work_struct hint: mlxreg_hotplug_work_handler+0x0/0x7f0 [mlxreg_hotplug] [ 2489.637097] WARNING: CPU: 5 PID: 3924 at lib/debugobjects.c:328 debug_print_object+0xfe/0x180 [ 2489.637165] RIP: 0010:debug_print_object+0xfe/0x180 ? [ 2489.637214] Call Trace: [ 2489.637225] __debug_check_no_obj_freed+0x25e/0x320 [ 2489.637231] kfree+0x82/0x110 [ 2489.637238] release_nodes+0x33c/0x4e0 [ 2489.637242] ? devres_remove_group+0x1b0/0x1b0 [ 2489.637247] device_release_driver_internal+0x146/0x270 [ 2489.637251] driver_detach+0x73/0xe0 [ 2489.637254] bus_remove_driver+0xa1/0x170 [ 2489.637261] __x64_sys_delete_module+0x29e/0x320 [ 2489.637265] ? __ia32_sys_delete_module+0x320/0x320 [ 2489.637268] ? blkcg_exit_queue+0x20/0x20 [ 2489.637273] ? task_work_run+0x7d/0x100 [ 2489.637278] ? exit_to_usermode_loop+0x5b/0xf0 [ 2489.637281] do_syscall_64+0x73/0x160 [ 2489.637287] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 2489.637290] RIP: 0033:0x7f95c3596fd7 The difference in release flow with and with no devm_free_irq is listed below: bus: 'platform': remove driver mlxreg-hotplug mlxreg_hotplug_remove(start) -> devm_free_irq (with new code) mlxreg_hotplug_remove (end) release_nodes (start) mlxreg-hotplug: DEVRES REL devm_hwmon_release (8 bytes) device: 'hwmon3': device_unregister PM: Removing info for No Bus:hwmon3 mlxreg-hotplug: DEVRES REL devm_kzalloc_release (88 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (6 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (5 bytes) mlxreg-hotplug: DEVRES REL devm_irq_release (16 bytes) (no new code) mlxreg-hotplug: DEVRES REL devm_kzalloc_release (1376 bytes) ------------[ cut here ]------------ (no new code): ODEBUG: free active (active state 0) object type: work_struct hint: mlxreg_hotplug_work_handler release_nodes(end) driver: 'mlxreg-hotplug': driver_release Fixes: 1f976f6978bf ("platform/x86: Move Mellanox platform hotplug driver to platform/mellanox") Signed-off-by: Vadim Pasternak Signed-off-by: Andy Shevchenko Signed-off-by: Sasha Levin --- drivers/platform/mellanox/mlxreg-hotplug.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/platform/mellanox/mlxreg-hotplug.c b/drivers/platform/mellanox/mlxreg-hotplug.c index 687ce6817d0d..f85a1b9d129b 100644 --- a/drivers/platform/mellanox/mlxreg-hotplug.c +++ b/drivers/platform/mellanox/mlxreg-hotplug.c @@ -694,6 +694,7 @@ static int mlxreg_hotplug_remove(struct platform_device *pdev) /* Clean interrupts setup. */ mlxreg_hotplug_unset_irq(priv); + devm_free_irq(&pdev->dev, priv->irq, priv); return 0; } -- 2.20.1