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iio: tsl2x7x/tsl2772: avoid potential division by zero

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It may be possible for tsl2772_get_lux to return a zero lux value
and hence a division by zero can occur when lux_val is zero. Check
for this case and return -ERANGE to avoid the division by zero.

Detected by CoverityScan, CID#1469484 ("Division or modulo by zero")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Colin Ian King 2018-05-30 19:19:36 +01:00 committed by Jonathan Cameron
parent 13399ff25f
commit 288320f6e9
1 changed files with 2 additions and 0 deletions
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2
drivers/iio/light/tsl2772.c
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@ -582,6 +582,8 @@ static int tsl2772_als_calibrate(struct iio_dev *indio_dev)
"%s: failed to get lux\n", __func__);
return lux_val;
}
if (lux_val == 0)
return -ERANGE;
ret = (chip->settings.als_cal_target * chip->settings.als_gain_trim) /
lux_val;