[PATCH v3 7/9] staging: iio: tsl2x7x: add range checking to tsl2x7x_write_raw

Brian Masney
2018-05-11T00:12:21Z

The CALIBBIAS and INT_TIME masks in tsl2x7x_write_raw did not have any
range checking in place so this patch adds the appropriate range
checking. The defines TSL2X7X_ALS_GAIN_TRIM_{MIN,MAX} are also
introduced by this patch.

Signed-off-by: Brian Masney <masneyb@onstation.org>
---
drivers/staging/iio/light/tsl2x7x.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
index 0218eabcd6d7..f9500afab30c 100644
--- a/drivers/staging/iio/light/tsl2x7x.c
+++ b/drivers/staging/iio/light/tsl2x7x.c
@@ -103,6 +103,9 @@
#define TSL2X7X_CNTL_PROXPON_ENBL 0x0F
#define TSL2X7X_CNTL_INTPROXPON_ENBL 0x2F

+#define TSL2X7X_ALS_GAIN_TRIM_MIN 250
+#define TSL2X7X_ALS_GAIN_TRIM_MAX 4000
+
/* TAOS txx2x7x Device family members */
enum {
tsl2571,
@@ -581,7 +584,7 @@ static int tsl2x7x_als_calibrate(struct iio_dev *indio_dev)

ret = (chip->settings.als_cal_target * chip->settings.als_gain_trim) /
lux_val;
- if (ret < 250 || ret > 4000)
+ if (ret < TSL2X7X_ALS_GAIN_TRIM_MIN || ret > TSL2X7X_ALS_GAIN_TRIM_MAX)
return -ERANGE;

chip->settings.als_gain_trim = ret;
@@ -1209,9 +1212,17 @@ static int tsl2x7x_write_raw(struct iio_dev *indio_dev,
}
break;
case IIO_CHAN_INFO_CALIBBIAS:
+ if (val < TSL2X7X_ALS_GAIN_TRIM_MIN ||
+ val > TSL2X7X_ALS_GAIN_TRIM_MAX)
+ return -EINVAL;
+
chip->settings.als_gain_trim = val;
break;
case IIO_CHAN_INFO_INT_TIME:
+ if (val != 0 || val2 < tsl2x7x_int_time_avail[chip->id][1] ||
+ val2 > tsl2x7x_int_time_avail[chip->id][5])
+ return -EINVAL;
+
chip->settings.als_time = 256 -
(val2 / tsl2x7x_int_time_avail[chip->id][3]);
break;
--
2.14.3