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| author | Marius Cristea <marius.cristea@microchip.com> | 2024-04-25 14:42:32 +0300 |
|---|---|---|
| committer | Jonathan Cameron <jonathan.cameron@huawei.com> | 2024-05-03 11:48:56 +0100 |
| commit | 51fafb3cd7fcf4f4682693b4d2883e2a5bfffe33 (patch) | |
| tree | 8e604543524af872fce843018a25dfccfc490820 /drivers/iio | |
| parent | bf8367b00c33c64a9391c262bb2e11d274c9f2a4 (diff) | |
| download | linux-stable-51fafb3cd7fcf4f4682693b4d2883e2a5bfffe33.tar.gz linux-stable-51fafb3cd7fcf4f4682693b4d2883e2a5bfffe33.tar.bz2 linux-stable-51fafb3cd7fcf4f4682693b4d2883e2a5bfffe33.zip | |
iio: adc: PAC1934: fix accessing out of bounds array index
Fix accessing out of bounds array index for average
current and voltage measurements. The device itself has
only 4 channels, but in sysfs there are "fake"
channels for the average voltages and currents too.
Fixes: 0fb528c8255b ("iio: adc: adding support for PAC193x")
Reported-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Marius Cristea <marius.cristea@microchip.com>
Closes: https://lore.kernel.org/linux-iio/20240405-embellish-bonnet-ab5f10560d93@wendy/
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240425114232.81390-1-marius.cristea@microchip.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/adc/pac1934.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iio/adc/pac1934.c b/drivers/iio/adc/pac1934.c index f751260605e4..456f12faa348 100644 --- a/drivers/iio/adc/pac1934.c +++ b/drivers/iio/adc/pac1934.c @@ -787,6 +787,15 @@ static int pac1934_read_raw(struct iio_dev *indio_dev, s64 curr_energy; int ret, channel = chan->channel - 1; + /* + * For AVG the index should be between 5 to 8. + * To calculate PAC1934_CH_VOLTAGE_AVERAGE, + * respectively PAC1934_CH_CURRENT real index, we need + * to remove the added offset (PAC1934_MAX_NUM_CHANNELS). + */ + if (channel >= PAC1934_MAX_NUM_CHANNELS) + channel = channel - PAC1934_MAX_NUM_CHANNELS; + ret = pac1934_retrieve_data(info, PAC1934_MIN_UPDATE_WAIT_TIME_US); if (ret < 0) return ret; |