Patch "hwmon: (nct7802) Fix overflows seen when writing into limit attributes" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    hwmon: (nct7802) Fix overflows seen when writing into limit attributes

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hwmon-nct7802-fix-overflows-seen-when-writing-into-limit-attributes.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c0d04e9112ad59d73f23f3b0f6726c5e798dfcbf Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Sun, 4 Dec 2016 18:15:25 -0800
Subject: hwmon: (nct7802) Fix overflows seen when writing into limit attributes

From: Guenter Roeck <linux@roeck-us.net>

commit c0d04e9112ad59d73f23f3b0f6726c5e798dfcbf upstream.

Fix overflows seen when writing voltage and temperature limit attributes.

The value passed to DIV_ROUND_CLOSEST() needs to be clamped, and the
value parameter passed to nct7802_write_fan_min() is an unsigned long.

Also, writing values larger than 2700000 into a fan limit attribute results
in writing 0 into the chip's limit registers. The exact behavior when
writing this value is unspecified. For consistency, report a limit of
1350000 if the chip register reads 0. This may be wrong, and the chip
behavior should be verified with the actual chip, but it is better than
reporting a value of 0 (which, when written, results in writing a value
of 0x1fff into the chip register).

Fixes: 3434f3783580 ("hwmon: Driver for Nuvoton NCT7802Y")
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/hwmon/nct7802.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/hwmon/nct7802.c
+++ b/drivers/hwmon/nct7802.c
@@ -259,13 +259,15 @@ static int nct7802_read_fan_min(struct n
 		ret = 0;
 	else if (ret)
 		ret = DIV_ROUND_CLOSEST(1350000U, ret);
+	else
+		ret = 1350000U;
 abort:
 	mutex_unlock(&data->access_lock);
 	return ret;
 }
 
 static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low,
-				 u8 reg_fan_high, unsigned int limit)
+				 u8 reg_fan_high, unsigned long limit)
 {
 	int err;
 
@@ -326,8 +328,8 @@ static int nct7802_write_voltage(struct
 	int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr];
 	int err;
 
+	voltage = clamp_val(voltage, 0, 0x3ff * nct7802_vmul[nr]);
 	voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]);
-	voltage = clamp_val(voltage, 0, 0x3ff);
 
 	mutex_lock(&data->access_lock);
 	err = regmap_write(data->regmap,
@@ -402,7 +404,7 @@ static ssize_t store_temp(struct device
 	if (err < 0)
 		return err;
 
-	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
+	val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
 
 	err = regmap_write(data->regmap, nr, val & 0xff);
 	return err ? : count;


Patches currently in stable-queue which might be from linux@roeck-us.net are

queue-4.9/hwmon-ds620-fix-overflows-seen-when-writing-temperature-limits.patch
queue-4.9/hwmon-lm90-fix-temp1_max_alarm-attribute.patch
queue-4.9/hwmon-amc6821-sign-extension-temperature.patch
queue-4.9/hwmon-scpi-fix-module-autoload.patch
queue-4.9/hwmon-nct7802-fix-overflows-seen-when-writing-into-limit-attributes.patch
queue-4.9/cris-only-build-flash-rescue-image-if-config_etrax_axisflashmap-is-selected.patch
queue-4.9/hwmon-g762-fix-overflows-and-crash-seen-when-writing-limit-attributes.patch