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iio: adc: ad7124: fix division by zero in ad7124_set_channel_odr()

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In the ad7124_write_raw() function, parameter val can potentially
be zero. This may lead to a division by zero when DIV_ROUND_CLOSEST()
is called within ad7124_set_channel_odr(). The ad7124_write_raw()
function is invoked through the sequence: iio_write_channel_raw() ->
iio_write_channel_attribute() -> iio_channel_write(), with no checks
in place to ensure val is non-zero.

Cc: stable@vger.kernel.org
Fixes: 7b8d045e49 ("iio: adc: ad7124: allow more than 8 channels")
Signed-off-by: Zicheng Qu <quzicheng@huawei.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20241022134330.574601-1-quzicheng@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Zicheng Qu 2024-10-22 13:43:30 +00:00 committed by Jonathan Cameron
parent 6bd301819f
commit efa353ae1b
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/adc/ad7124.c
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@ -637,7 +637,7 @@ static int ad7124_write_raw(struct iio_dev *indio_dev,
switch (info) { switch (info) {
case IIO_CHAN_INFO_SAMP_FREQ: case IIO_CHAN_INFO_SAMP_FREQ:
if (val2 != 0) { if (val2 != 0 || val == 0) {
ret = -EINVAL; ret = -EINVAL;
break; break;
} }