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hwmon: (ntc_thermistor) Avoid math overflow
authorDoug Anderson <dianders@chromium.org>
Thu, 13 Feb 2014 22:39:34 +0000 (14:39 -0800)
committerGuenter Roeck <linux@roeck-us.net>
Fri, 14 Feb 2014 03:43:52 +0000 (19:43 -0800)
commitd3d89c468ceebbcf9423d1a3d66c5bf91f569570
tree857d835b47cdce23bfaa37ed81c4b96a3a5cd54dtree | snapshot
parentb28a960c42fcd9cfc987441fa6d1c1a471f0f9edcommit | diff
hwmon: (ntc_thermistor) Avoid math overflow

The ntc thermistor code was doing math whose temporary result might
have overflowed 32-bits.  We need some casts in there to make it safe.

In one example I found:
- pullup_uV: 1800000
- result of iio_read_channel_raw: 3226
- 1800000 * 3226 => 0x15a1cbc80

Signed-off-by: Doug Anderson <dianders@chromium.org>
Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
drivers/hwmon/ntc_thermistor.c diff | blob | history
John Crispins staging tree