tree 8334fcb24a1feafc8fbb7672e4cfc5a01d84c144
parent 7576750f036b5ec913aac2a165ce75ab3b7beee3
author Anton Vasilyev <vasilyev@ispras.ru> 1502383592 +0300
committer Guenter Roeck <linux@roeck-us.net> 1502637848 -0700

hwmon: (stts751) buffer overrun on wrong chip configuration

If stts751 hw by some reason reports conversion rate bigger then 9:
        ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_RATE);
then dereferencing stts751_intervals[priv->interval] leads to buffer
overrun.

The patch adds sanity check for value stored on chip.

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 7f07ec0fa17a ("hwmon: new driver for ST stts751 thermal sensor")
Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>