[PATCH] iio: adc: qcom-spmi-adc5: Verify channel numbers from DT

[Matthias Kaehlcke]

The driver only defines a subset of all possible ADC channels. Channel
numbers read from the device tree are accepted as long as they don't
exceed a max value, even when no channel definition exists. Add a
check to abort initialization in this case.

Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
---
 drivers/iio/adc/qcom-spmi-adc5.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/qcom-spmi-adc5.c b/drivers/iio/adc/qcom-spmi-adc5.c
index 9c8e6f9e8248..ab5bec917c0a 100644
--- a/drivers/iio/adc/qcom-spmi-adc5.c
+++ b/drivers/iio/adc/qcom-spmi-adc5.c
@@ -519,7 +519,8 @@ static int adc5_get_dt_channel_data(struct adc5_chip *adc,
 		return ret;
 	}
 
-	if (chan > ADC5_PARALLEL_ISENSE_VBAT_IDATA) {
+	if (chan > ADC5_PARALLEL_ISENSE_VBAT_IDATA ||
+	    !data->adc_chans[chan].datasheet_name) {
 		dev_err(dev, "%s invalid channel number %d\n", name, chan);
 		return -EINVAL;
 	}
-- 
2.19.0.rc0.228.g281dcd1b4d0-goog