6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Zicheng Qu <quzicheng@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Zicheng Qu <quzicheng@xxxxxxxxxx>
Link: https://patch.msgid.link/20241028142027.1032332-1-quzicheng@xxxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/ad7780.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iio/adc/ad7780.c
+++ b/drivers/iio/adc/ad7780.c
@@ -152,7 +152,7 @@ static int ad7780_write_raw(struct iio_d
switch (m) {
case IIO_CHAN_INFO_SCALE:
- if (val != 0)
+ if (val != 0 || val2 == 0)
return -EINVAL;
vref = st->int_vref_mv * 1000000LL;
