[PATCH 3.16 090/370] hwmon: (ds620) Fix overflows seen when writing temperature limits

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.kernel
Subject	[PATCH 3.16 090/370] hwmon: (ds620) Fix overflows seen when writing temperature limits
Date	2017-03-10 15:20 +0100
Message-ID	<tjtyH-5cC-35@gated-at.bofh.it> (permalink)
References	<tjrnb-3sF-3@gated-at.bofh.it>
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3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit e36ce99ee0815d7919a7b589bfb66f3de50b6bc7 upstream.

Module test reports:

temp1_max: Suspected overflow: [160000 vs. 0]
temp1_min: Suspected overflow: [160000 vs. 0]

This is seen because the values passed when writing temperature limits
are unbound.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Fixes: 6099469805c2 ("hwmon: Support for Dallas Semiconductor DS620")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/hwmon/ds620.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwmon/ds620.c
+++ b/drivers/hwmon/ds620.c
@@ -166,7 +166,7 @@ static ssize_t set_temp(struct device *d
 	if (res)
 		return res;
 
-	val = (val * 10 / 625) * 8;
+	val = (clamp_val(val, -128000, 128000) * 10 / 625) * 8;
 
 	mutex_lock(&data->update_lock);
 	data->temp[attr->index] = val;

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[PATCH 3.16 090/370] hwmon: (ds620) Fix overflows seen when  writing temperature limits Ben Hutchings <ben@decadent.org.uk> - 2017-03-10 15:20 +0100

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