From patchwork Sat Dec 19 12:54:37 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Javi Merino X-Patchwork-Id: 7890241 X-Patchwork-Delegate: rui.zhang@intel.com Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id DA3D99F1C2 for ; Sat, 19 Dec 2015 12:55:46 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 00033204EB for ; Sat, 19 Dec 2015 12:55:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D27B204D9 for ; Sat, 19 Dec 2015 12:55:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751441AbbLSMys (ORCPT ); Sat, 19 Dec 2015 07:54:48 -0500 Received: from foss.arm.com ([217.140.101.70]:44592 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751272AbbLSMys (ORCPT ); Sat, 19 Dec 2015 07:54:48 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 717A749; Sat, 19 Dec 2015 04:54:21 -0800 (PST) Received: from e104805-lin.cambridge.arm.com (e104805-lin.cambridge.arm.com [10.1.205.32]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id BB8E13F308; Sat, 19 Dec 2015 04:54:45 -0800 (PST) From: Javi Merino To: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Javi Merino , Amit Daniel Kachhap , Viresh Kumar , Zhang Rui , Eduardo Valentin Subject: [PATCH] thermal: cpu_cooling: fix out of bounds access in time_in_idle Date: Sat, 19 Dec 2015 12:54:37 +0000 Message-Id: <1450529677-23426-1-git-send-email-javi.merino@arm.com> X-Mailer: git-send-email 1.9.1 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In __cpufreq_cooling_register() we allocate the arrays for time_in_idle and time_in_idle_timestamp to be as big as the number of cpus in this cpufreq device. However, in get_load() we access this array using the cpu number as index, which can result in an out of bound access. Index time_in_idle{,_timestamp} using the index in the cpufreq_device's allowed_cpus mask, as we do for the load_cpu array in cpufreq_get_requested_power() Reported-by: Nicolas Boichat Cc: Amit Daniel Kachhap Cc: Viresh Kumar Cc: Zhang Rui Cc: Eduardo Valentin Signed-off-by: Javi Merino Acked-by: Viresh Kumar Tested-by: Nicolas Boichat --- drivers/thermal/cpu_cooling.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index e3fbc5a5d88f..bd1bab9eade0 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -377,26 +377,28 @@ static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_device, * get_load() - get load for a cpu since last updated * @cpufreq_device: &struct cpufreq_cooling_device for this cpu * @cpu: cpu number + * @cpu_idx: index of the cpu in cpufreq_device->allowed_cpus * * Return: The average load of cpu @cpu in percentage since this * function was last called. */ -static u32 get_load(struct cpufreq_cooling_device *cpufreq_device, int cpu) +static u32 get_load(struct cpufreq_cooling_device *cpufreq_device, int cpu, + int cpu_idx) { u32 load; u64 now, now_idle, delta_time, delta_idle; now_idle = get_cpu_idle_time(cpu, &now, 0); - delta_idle = now_idle - cpufreq_device->time_in_idle[cpu]; - delta_time = now - cpufreq_device->time_in_idle_timestamp[cpu]; + delta_idle = now_idle - cpufreq_device->time_in_idle[cpu_idx]; + delta_time = now - cpufreq_device->time_in_idle_timestamp[cpu_idx]; if (delta_time <= delta_idle) load = 0; else load = div64_u64(100 * (delta_time - delta_idle), delta_time); - cpufreq_device->time_in_idle[cpu] = now_idle; - cpufreq_device->time_in_idle_timestamp[cpu] = now; + cpufreq_device->time_in_idle[cpu_idx] = now_idle; + cpufreq_device->time_in_idle_timestamp[cpu_idx] = now; return load; } @@ -598,7 +600,7 @@ static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, u32 load; if (cpu_online(cpu)) - load = get_load(cpufreq_device, cpu); + load = get_load(cpufreq_device, cpu, i); else load = 0;