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=-8.4 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_SBL,URIBL_SBL_A,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 3BA0FC65BA7 for ; Fri, 5 Oct 2018 16:14:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 025B02147C for ; Fri, 5 Oct 2018 16:14:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="DwcHsIEW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 025B02147C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.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 S1729250AbeJEXOD (ORCPT ); Fri, 5 Oct 2018 19:14:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:51102 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729136AbeJEXOC (ORCPT ); Fri, 5 Oct 2018 19:14:02 -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 E9B48208E7; Fri, 5 Oct 2018 16:14:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1538756079; bh=YKH5b5vYpcUrL7lvWUE9vbkk452WFxnhtyWcwaJxo+Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DwcHsIEWBelUQaDpqX40yWvtO8JMjc+hzsGBC1SnPojPKZtNLMQGKADMsCB/aGnhu MzsJ6flwzr/oOfjRj6Wmw/TnZ3lslgUvdA7sm0xt0c43w1493P5pfuU1WHLNGCzl2C Jbo+gpq5C4KQ3fE+Y0lzq9EXphImAenU/NKaA7qs= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guenter Roeck , Sasha Levin Subject: [PATCH AUTOSEL 4.18 15/48] hwmon: (nct6775) Fix access to fan pulse registers Date: Fri, 5 Oct 2018 12:13:51 -0400 Message-Id: <20181005161424.20521-15-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181005161424.20521-1-sashal@kernel.org> References: <20181005161424.20521-1-sashal@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guenter Roeck [ Upstream commit c793279c77035053e67937f5743c6ebfc303e7c5 ] Not all fans have a fan pulse register. This can result in reading beyond the end of REG_FAN_PULSES and FAN_PULSE_SHIFT arrays, and was reported by smatch as possible error. 1672 for (i = 0; i < ARRAY_SIZE(data->rpm); i++) { ^^^^^^^^^^^^^^^^^^^^^^^^ This is a 7 element array. ... 1685 data->fan_pulses[i] = 1686 (nct6775_read_value(data, data->REG_FAN_PULSES[i]) 1687 >> data->FAN_PULSE_SHIFT[i]) & 0x03; ^^^^^^^^^^^^^^^^^^^^^^^^ FAN_PULSE_SHIFT is either 5 or 6 elements. To fix the problem, we have to ensure that all REG_FAN_PULSES and FAN_PULSE_SHIFT have the appropriate length, and that REG_FAN_PULSES is only read if the register actually exists. Fixes: 6c009501ff200 ("hwmon: (nct6775) Add support for NCT6102D/6106D") Reported-by: Dan Carpenter Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/nct6775.c | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-) diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index b89e8379d898..6f40a9435731 100644 --- a/drivers/hwmon/nct6775.c +++ b/drivers/hwmon/nct6775.c @@ -299,8 +299,9 @@ static const u16 NCT6775_REG_PWM_READ[] = { static const u16 NCT6775_REG_FAN[] = { 0x630, 0x632, 0x634, 0x636, 0x638 }; static const u16 NCT6775_REG_FAN_MIN[] = { 0x3b, 0x3c, 0x3d }; -static const u16 NCT6775_REG_FAN_PULSES[] = { 0x641, 0x642, 0x643, 0x644, 0 }; -static const u16 NCT6775_FAN_PULSE_SHIFT[] = { 0, 0, 0, 0, 0, 0 }; +static const u16 NCT6775_REG_FAN_PULSES[NUM_FAN] = { + 0x641, 0x642, 0x643, 0x644 }; +static const u16 NCT6775_FAN_PULSE_SHIFT[NUM_FAN] = { }; static const u16 NCT6775_REG_TEMP[] = { 0x27, 0x150, 0x250, 0x62b, 0x62c, 0x62d }; @@ -425,8 +426,8 @@ static const u8 NCT6776_PWM_MODE_MASK[] = { 0x01, 0, 0, 0, 0, 0 }; static const u16 NCT6776_REG_FAN_MIN[] = { 0x63a, 0x63c, 0x63e, 0x640, 0x642, 0x64a, 0x64c }; -static const u16 NCT6776_REG_FAN_PULSES[] = { - 0x644, 0x645, 0x646, 0x647, 0x648, 0x649, 0 }; +static const u16 NCT6776_REG_FAN_PULSES[NUM_FAN] = { + 0x644, 0x645, 0x646, 0x647, 0x648, 0x649 }; static const u16 NCT6776_REG_WEIGHT_DUTY_BASE[] = { 0x13e, 0x23e, 0x33e, 0x83e, 0x93e, 0xa3e }; @@ -502,8 +503,8 @@ static const s8 NCT6779_BEEP_BITS[] = { static const u16 NCT6779_REG_FAN[] = { 0x4b0, 0x4b2, 0x4b4, 0x4b6, 0x4b8, 0x4ba, 0x660 }; -static const u16 NCT6779_REG_FAN_PULSES[] = { - 0x644, 0x645, 0x646, 0x647, 0x648, 0x649, 0 }; +static const u16 NCT6779_REG_FAN_PULSES[NUM_FAN] = { + 0x644, 0x645, 0x646, 0x647, 0x648, 0x649 }; static const u16 NCT6779_REG_CRITICAL_PWM_ENABLE[] = { 0x136, 0x236, 0x336, 0x836, 0x936, 0xa36, 0xb36 }; @@ -779,8 +780,8 @@ static const u16 NCT6106_REG_TEMP_CONFIG[] = { static const u16 NCT6106_REG_FAN[] = { 0x20, 0x22, 0x24 }; static const u16 NCT6106_REG_FAN_MIN[] = { 0xe0, 0xe2, 0xe4 }; -static const u16 NCT6106_REG_FAN_PULSES[] = { 0xf6, 0xf6, 0xf6, 0, 0 }; -static const u16 NCT6106_FAN_PULSE_SHIFT[] = { 0, 2, 4, 0, 0 }; +static const u16 NCT6106_REG_FAN_PULSES[] = { 0xf6, 0xf6, 0xf6 }; +static const u16 NCT6106_FAN_PULSE_SHIFT[] = { 0, 2, 4 }; static const u8 NCT6106_REG_PWM_MODE[] = { 0xf3, 0xf3, 0xf3 }; static const u8 NCT6106_PWM_MODE_MASK[] = { 0x01, 0x02, 0x04 }; @@ -1682,9 +1683,13 @@ static struct nct6775_data *nct6775_update_device(struct device *dev) if (data->has_fan_min & BIT(i)) data->fan_min[i] = nct6775_read_value(data, data->REG_FAN_MIN[i]); - data->fan_pulses[i] = - (nct6775_read_value(data, data->REG_FAN_PULSES[i]) - >> data->FAN_PULSE_SHIFT[i]) & 0x03; + + if (data->REG_FAN_PULSES[i]) { + data->fan_pulses[i] = + (nct6775_read_value(data, + data->REG_FAN_PULSES[i]) + >> data->FAN_PULSE_SHIFT[i]) & 0x03; + } nct6775_select_fan_div(dev, data, i, reg); } -- 2.17.1