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hwmon: (lm85) Fix overflows seen when writing voltage limit attributes

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Writes into voltage limit attributes can overflow due to an unbound
multiplication.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2016-12-04 18:16:48 -08:00
parent 12fa55ccc4
commit 67b2003485
1 changed files with 2 additions and 1 deletions
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3
drivers/hwmon/lm85.c
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@ -136,7 +136,8 @@ static const int lm85_scaling[] = { /* .001 Volts */
#define SCALE(val, from, to) (((val) * (to) + ((from) / 2)) / (from))
#define INS_TO_REG(n, val) \
clamp_val(SCALE(val, lm85_scaling[n], 192), 0, 255)
SCALE(clamp_val(val, 0, 255 * lm85_scaling[n] / 192), \
lm85_scaling[n], 192)
#define INSEXT_FROM_REG(n, val, ext) \
SCALE(((val) << 4) + (ext), 192 << 4, lm85_scaling[n])