diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index b77f39f305d8..90f0e257e6d1 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -1608,11 +1608,16 @@ static int stm32_adc_read_raw(struct iio_dev *indio_dev,
 			ret = stm32_adc_single_conv(indio_dev, chan, val);
 		else
 			ret = -EINVAL;
-
-		if (mask == IIO_CHAN_INFO_PROCESSED)
-			*val = STM32_ADC_VREFINT_VOLTAGE * adc->vrefint.vrefint_cal / *val;
-
 		iio_device_release_direct(indio_dev);
+		if (ret < 0)
+			return ret;
+
+		if (mask == IIO_CHAN_INFO_PROCESSED) {
+			if (*val == 0)
+				return -EINVAL;
+			*val = STM32_ADC_VREFINT_VOLTAGE * adc->vrefint.vrefint_cal / *val;
+		}
+
 		return ret;
 
 	case IIO_CHAN_INFO_SCALE: