Re: [PATCH v6 06/12] iio: adc: ad4170: Add digital filter and sample frequency config support

[kernel test robot <lkp@intel.com>]

Hi Marcelo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 4c6073fec2fee4827fa0dd8a4ab4e6f7bbc05ee6]

url:    https://github.com/intel-lab-lkp/linux/commits/Marcelo-Schmitt/dt-bindings-iio-adc-Add-AD4170/20250619-014200
base:   4c6073fec2fee4827fa0dd8a4ab4e6f7bbc05ee6
patch link:    https://lore.kernel.org/r/bc0261373936511a6ae5b25082e36ac5f112f6db.1750258776.git.marcelo.schmitt%40analog.com
patch subject: [PATCH v6 06/12] iio: adc: ad4170: Add digital filter and sample frequency config support
config: microblaze-randconfig-r133-20250620 (https://download.01.org/0day-ci/archive/20250620/202506201000.WjqDvyXl-lkp@intel.com/config)
compiler: microblaze-linux-gcc (GCC) 8.5.0
reproduce: (https://download.01.org/0day-ci/archive/20250620/202506201000.WjqDvyXl-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506201000.WjqDvyXl-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/iio/adc/ad4170.c: In function 'ad4170_read_avail':
>> drivers/iio/adc/ad4170.c:1237:18: warning: array subscript 4294967274 is above array bounds of 'int[3][18][2]' [-Warray-bounds]
      *vals = (int *)st->sps_tbl[f_type];
                     ^~


vim +1237 drivers/iio/adc/ad4170.c

  1219	
  1220	static int ad4170_read_avail(struct iio_dev *indio_dev,
  1221				     struct iio_chan_spec const *chan,
  1222				     const int **vals, int *type, int *length,
  1223				     long info)
  1224	{
  1225		struct ad4170_state *st = iio_priv(indio_dev);
  1226		struct ad4170_chan_info *chan_info = &st->chan_infos[chan->address];
  1227		enum ad4170_filter_type f_type;
  1228	
  1229		switch (info) {
  1230		case IIO_CHAN_INFO_SCALE:
  1231			*vals = (int *)chan_info->scale_tbl;
  1232			*length = ARRAY_SIZE(chan_info->scale_tbl) * 2;
  1233			*type = IIO_VAL_INT_PLUS_NANO;
  1234			return IIO_AVAIL_LIST;
  1235		case IIO_CHAN_INFO_SAMP_FREQ:
  1236			f_type = ad4170_get_filter_type(indio_dev, chan);
> 1237			*vals = (int *)st->sps_tbl[f_type];
  1238			*type = IIO_VAL_INT_PLUS_MICRO;
  1239			switch (f_type) {
  1240			case AD4170_SINC5_AVG:
  1241			case AD4170_SINC3:
  1242				*length = ARRAY_SIZE(ad4170_sinc3_filt_fs_tbl) * 2;
  1243				return IIO_AVAIL_LIST;
  1244			case AD4170_SINC5:
  1245				*length = ARRAY_SIZE(ad4170_sinc5_filt_fs_tbl) * 2;
  1246				return IIO_AVAIL_LIST;
  1247			default:
  1248				return -EINVAL;
  1249			}
  1250		default:
  1251			return -EINVAL;
  1252		}
  1253	}
  1254	

-- 
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https://github.com/intel/lkp-tests/wiki