From: Colin Ian King colin.king@canonical.com

commit af0e1871d79cfbb91f732d2c6fa7558e45c31038 upstream.

The lux_val returned from tsl2583_get_lux can potentially be zero, so check for this to avoid a division by zero and an overflowed gain_trim_val.

Fixes clang scan-build warning:

drivers/iio/light/tsl2583.c:345:40: warning: Either the condition 'lux_val<0' is redundant or there is division by zero at line 345. [zerodivcond]

Fixes: ac4f6eee8fe8 ("staging: iio: TAOS tsl258x: Device driver") Signed-off-by: Colin Ian King colin.king@canonical.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com [iwamatsu: Change file path.] [Colin Ian King: minor context adjustments for 4.9.y] Signed-off-by: Nobuhiro Iwamatsu nobuhiro1.iwamatsu@toshiba.co.jp --- drivers/staging/iio/light/tsl2583.c | 9 +++++++++ 1 file changed, 9 insertions(+)

diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c index 08f1583ee34e..fb3ec56d45b6 100644 --- a/drivers/staging/iio/light/tsl2583.c +++ b/drivers/staging/iio/light/tsl2583.c @@ -382,6 +382,15 @@ static int taos_als_calibrate(struct iio_dev *indio_dev) dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n"); return lux_val; } + + /* Avoid division by zero of lux_value later on */ + if (lux_val == 0) { + dev_err(&chip->client->dev, + "%s: lux_val of 0 will produce out of range trim_value\n", + __func__); + return -ENODATA; + } + gain_trim_val = (unsigned int)(((chip->taos_settings.als_cal_target) * chip->taos_settings.als_gain_trim) / lux_val);