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| author | Colin Ian King <colin.king@canonical.com> | 2021-05-07 19:30:41 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-22 10:38:30 +0200 |
| commit | 0e0a7106082f6277fdd62a79d893092e240a57a8 (patch) | |
| tree | 59b3419823b9ca1e3377b9bd7262afe435a73518 | |
| parent | d744ccbfb5aeb451617cc6b73a3fa0a102db0c2c (diff) | |
| download | linux-stable-0e0a7106082f6277fdd62a79d893092e240a57a8.tar.gz linux-stable-0e0a7106082f6277fdd62a79d893092e240a57a8.tar.bz2 linux-stable-0e0a7106082f6277fdd62a79d893092e240a57a8.zip | |
iio: tsl2583: Fix division by a zero lux_val
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.]
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/iio/light/tsl2583.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c index 3100d960fe2c..da2a2ff4cdb9 100644 --- a/drivers/staging/iio/light/tsl2583.c +++ b/drivers/staging/iio/light/tsl2583.c @@ -378,6 +378,15 @@ 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); |