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ad7780: fix division by zero in ad7780_write_raw()

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commit c174b53e95adf2eece2afc56cd9798374919f99a upstream.

In the ad7780_write_raw() , val2 can be zero, which might lead to a
division by zero error in DIV_ROUND_CLOSEST(). The ad7780_write_raw()
is based on iio_info's write_raw. While val is explicitly declared that
can be zero (in read mode), val2 is not specified to be non-zero.

Fixes: 9085daa4ab ("staging: iio: ad7780: add gain & filter gpio support")
Cc: stable@vger.kernel.org
Signed-off-by: Zicheng Qu <quzicheng@huawei.com>
Link: https://patch.msgid.link/20241028142027.1032332-1-quzicheng@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zicheng Qu 2024-10-28 14:20:27 +00:00 committed by Greg Kroah-Hartman
parent 4c028c1bf8
commit 022e13518b
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/adc/ad7780.c
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@ -152,7 +152,7 @@ static int ad7780_write_raw(struct iio_dev *indio_dev,
switch (m) {
case IIO_CHAN_INFO_SCALE:
if (val != 0)
if (val != 0 || val2 == 0)
return -EINVAL;
vref = st->int_vref_mv * 1000000LL;