[PATCH v3 01/13] iio: adc: ad4134: Adjust register map range

[Marcelo Schmitt]

Due to a off-by-one mistake, privileged users would be able to read from an
unsupported register address when reading device registers through a debug
interface. Correct the off-by-one mistake at the high register map range to
prevent access of unsupported addresses.

Fixes: e0bc6d7e2584 ("iio: adc: Initial support for AD4134")
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@xxxxxxxxxx>
---
New patch in v3.

 drivers/iio/adc/ad4134.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/ad4134.c b/drivers/iio/adc/ad4134.c
index 70f80bf1825f..e53c10b9a44a 100644
--- a/drivers/iio/adc/ad4134.c
+++ b/drivers/iio/adc/ad4134.c
@@ -111,7 +111,7 @@ static const struct regmap_range ad4134_regmap_rd_range[] = {
 	regmap_reg_range(AD4134_IFACE_CONFIG_A_REG, AD4134_SILICON_REV_REG),
 	regmap_reg_range(AD4134_SCRATCH_PAD_REG, AD4134_PW_DOWN_CTRL_REG),
 	regmap_reg_range(AD4134_DEVICE_STATUS_REG, AD4134_AIN_OR_ERROR_REG),
-	regmap_reg_range(AD4134_CH_VREG(0), AD4134_CH_VREG(AD4134_NUM_CHANNELS)),
+	regmap_reg_range(AD4134_CH_VREG(0), AD4134_CH_VREG(AD4134_NUM_CHANNELS - 1)),
 };
 
 static const struct regmap_range ad4134_regmap_wr_range[] = {
@@ -244,7 +244,7 @@ static const struct regmap_config ad4134_regmap_config = {
 	.reg_write = ad4134_reg_write,
 	.rd_table = &ad4134_regmap_rd_table,
 	.wr_table = &ad4134_regmap_wr_table,
-	.max_register = AD4134_CH_VREG(ARRAY_SIZE(ad4134_chan_set)),
+	.max_register = AD4134_CH_VREG(ARRAY_SIZE(ad4134_chan_set) - 1),
 };
 
 static int ad4134_read_raw(struct iio_dev *indio_dev,
-- 
2.53.0