[PATCH v1 1/1] iio: adc: tsc2046: fix memory corruption by preventing array overflow

[Oleksij Rempel <o.rempel@pengutronix.de>]

On one side we have indio_dev->num_channels includes all physical channels +
timestamp channel. On other side we have an array allocated only for
physical channels. So, fix memory corruption by ARRAY_SIZE() instead of
num_channels variable.

Fixes: 9374e8f5a38d ("iio: adc: add ADC driver for the TI TSC2046 controller")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/iio/adc/ti-tsc2046.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/ti-tsc2046.c b/drivers/iio/adc/ti-tsc2046.c
index 91f6bd5effe7..8126084616e6 100644
--- a/drivers/iio/adc/ti-tsc2046.c
+++ b/drivers/iio/adc/ti-tsc2046.c
@@ -395,7 +395,7 @@ static int tsc2046_adc_update_scan_mode(struct iio_dev *indio_dev,
 	mutex_lock(&priv->slock);
 
 	size = 0;
-	for_each_set_bit(ch_idx, active_scan_mask, indio_dev->num_channels) {
+	for_each_set_bit(ch_idx, active_scan_mask, ARRAY_SIZE(priv->l)) {
 		size += tsc2046_adc_group_set_layout(priv, group, ch_idx);
 		tsc2046_adc_group_set_cmd(priv, group, ch_idx);
 		group++;
@@ -561,7 +561,7 @@ static int tsc2046_adc_setup_spi_msg(struct tsc2046_adc_priv *priv)
 	 * enabled.
 	 */
 	size = 0;
-	for (ch_idx = 0; ch_idx < priv->dcfg->num_channels; ch_idx++)
+	for (ch_idx = 0; ch_idx < ARRAY_SIZE(priv->l); ch_idx++)
 		size += tsc2046_adc_group_set_layout(priv, ch_idx, ch_idx);
 
 	priv->tx = devm_kzalloc(&priv->spi->dev, size, GFP_KERNEL);
-- 
2.30.2