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hwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations 

Commit b50aa49638 ("hwmon: (lm90) Prevent integer underflows of
temperature calculations") addressed a number of underflow situations
when writing temperature limits. However, it missed one situation, seen
when an attempt is made to set the hysteresis value to MAX_LONG and the
critical temperature limit is negative.

Use clamp_val() when setting the hysteresis temperature to ensure that
the provided value can never overflow or underflow.

Fixes: b50aa49638 ("hwmon: (lm90) Prevent integer underflows of temperature calculations")
Cc: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2021-11-17 09:51:47 -08:00
parent fce15c45d3
commit 55840b9eae
1 changed files with 2 additions and 2 deletions
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4
drivers/hwmon/lm90.c
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@ -1160,8 +1160,8 @@ static int lm90_set_temphyst(struct lm90_data *data, long val)
else
temp = temp_from_s8(data->temp8[LOCAL_CRIT]);
/* prevent integer underflow */
val = max(val, -128000l);
/* prevent integer overflow/underflow */
val = clamp_val(val, -128000l, 255000l);
data->temp_hyst = hyst_to_reg(temp - val);
err = i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,