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| author | Guenter Roeck <linux@roeck-us.net> | 2021-11-17 20:51:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-29 14:28:47 +0300 |
| commit | d105f30bea9104c590a9e5b495cb8a49bdfe405f (patch) | |
| tree | cfeebb302e89dcc2142ed817058685ca27d09686 /drivers/hwmon | |
| parent | 4b8f0e940972ac34128efbe6cfb904356d088bfe (diff) | |
| download | linux-d105f30bea9104c590a9e5b495cb8a49bdfe405f.tar.xz | |
hwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations
[ Upstream commit 55840b9eae5367b5d5b29619dc2fb7e4596dba46 ]
Commit b50aa49638c7 ("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: b50aa49638c7 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/lm90.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index d40e3bb801d0..f6e6c7c6c73f 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -1143,8 +1143,8 @@ 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, |