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iio: adc: stm32-adc: fix possible division by zero in processed channel

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In case the conversion has failed or returned zero, processing *val
can lead to a division by zero. Need to check for errors, or converted
value is zero, before processing the data. In case the converted value
is zero, e.g. the Vrefint channel, this should be considered as invalid
in all cases.

Fixes: 0e346b2cfa ("iio: adc: stm32-adc: add vrefint calibration support")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/all/20260911161555.244F31F000FF@smtp.kernel.org/
Cc: stable@vger.kernel.org
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
This commit is contained in:
Fabrice Gasnier 2026-09-16 19:15:04 +02:00 committed by Jonathan Cameron
parent 9db3deeb2d
commit c5de6a6f85
1 changed files with 9 additions and 4 deletions
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13
drivers/iio/adc/stm32-adc.c
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@ -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: