ad7780: fix division by zero in ad7780_write_raw()

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: 9085daa4abcc ("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>

diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c
index a813fe04787c6009c6b2eb5ad327d27319fc9e5b..97b6774e7f5856d70c401f601d3d408dc836a073 100644 (file)
--- a/drivers/iio/adc/ad7780.c
+++ b/drivers/iio/adc/ad7780.c
@@ -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;