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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 0F75DC43381 for ; Sat, 30 Mar 2019 01:10:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CFFEF205C9 for ; Sat, 30 Mar 2019 01:10:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553908250; bh=soU3CoiIBBL9gjed41AaSXr7WbdRetYCKyRK9wzdiok=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=LqP6A4/zSBlg6OjlEt2ugiqvtLWX0GW36BgthAsMi/eX7Di5s0FBmMUvLG5KCexsL vfXQWGT36jogaaRwMygwfK4g2R9fuwbwbJCLCz30wQkp03Atxjm9qaoLXbcpSphInx klC05GwAuRmiHF+dBbUjBzqVvo7Qkk9ECUXsoOE0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731134AbfC3BKt (ORCPT ); Fri, 29 Mar 2019 21:10:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:57978 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730331AbfC3AvV (ORCPT ); Fri, 29 Mar 2019 20:51:21 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 96D1A206DD; Sat, 30 Mar 2019 00:51:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553907080; bh=soU3CoiIBBL9gjed41AaSXr7WbdRetYCKyRK9wzdiok=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bAgVFSdXLy/+F+cyz8oUNxJNJm7A/3phasVrTcUvGbfilpuzAJEcXMBKzbDZr/Xy3 CvCq/4d1KcPGV9oWiS7vvS6cKs60YTUVlusF3eLOJs3sWyKE1SG9+4dWbBTHir5Run BCYgWRtu06cLfzBMhfa/K06mdP/75nzLZat1vnKQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Phil Elwell , Zhang Rui , Sasha Levin , linux-pm@vger.kernel.org Subject: [PATCH AUTOSEL 5.0 22/67] thermal: bcm2835: Fix crash in bcm2835_thermal_debugfs Date: Fri, 29 Mar 2019 20:50:02 -0400 Message-Id: <20190330005047.25998-22-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190330005047.25998-1-sashal@kernel.org> References: <20190330005047.25998-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Phil Elwell [ Upstream commit 35122495a8c6683e863acf7b05a7036b2be64c7a ] "cat /sys/kernel/debug/bcm2835_thermal/regset" causes a NULL pointer dereference in bcm2835_thermal_debugfs. The driver makes use of the implementation details of the thermal framework to retrieve a pointer to its private data from a struct thermal_zone_device, and gets it wrong - leading to the crash. Instead, store its private data as the drvdata and retrieve the thermal_zone_device pointer from it. Fixes: bcb7dd9ef206 ("thermal: bcm2835: add thermal driver for bcm2835 SoC") Signed-off-by: Phil Elwell Signed-off-by: Zhang Rui Signed-off-by: Sasha Levin --- drivers/thermal/broadcom/bcm2835_thermal.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/thermal/broadcom/bcm2835_thermal.c b/drivers/thermal/broadcom/bcm2835_thermal.c index 720760cd493f..ba39647a690c 100644 --- a/drivers/thermal/broadcom/bcm2835_thermal.c +++ b/drivers/thermal/broadcom/bcm2835_thermal.c @@ -119,8 +119,7 @@ static const struct debugfs_reg32 bcm2835_thermal_regs[] = { static void bcm2835_thermal_debugfs(struct platform_device *pdev) { - struct thermal_zone_device *tz = platform_get_drvdata(pdev); - struct bcm2835_thermal_data *data = tz->devdata; + struct bcm2835_thermal_data *data = platform_get_drvdata(pdev); struct debugfs_regset32 *regset; data->debugfsdir = debugfs_create_dir("bcm2835_thermal", NULL); @@ -266,7 +265,7 @@ static int bcm2835_thermal_probe(struct platform_device *pdev) data->tz = tz; - platform_set_drvdata(pdev, tz); + platform_set_drvdata(pdev, data); /* * Thermal_zone doesn't enable hwmon as default, @@ -290,8 +289,8 @@ err_clk: static int bcm2835_thermal_remove(struct platform_device *pdev) { - struct thermal_zone_device *tz = platform_get_drvdata(pdev); - struct bcm2835_thermal_data *data = tz->devdata; + struct bcm2835_thermal_data *data = platform_get_drvdata(pdev); + struct thermal_zone_device *tz = data->tz; debugfs_remove_recursive(data->debugfsdir); thermal_zone_of_sensor_unregister(&pdev->dev, tz); -- 2.19.1