linux-kernel - [PATCH] ad7780: fix division by zero in ad7780_write

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Message-ID: <20241028142027.1032332-1-quzicheng@huawei.com>
Date: Mon, 28 Oct 2024 14:20:27 +0000
From: Zicheng Qu <quzicheng@...wei.com>
To: <Michael.Hennerich@...log.com>, <renatogeh@...il.com>, <lars@...afoo.de>,
	<jic23@...nel.org>, <giuliano.belinassi@....br>, <linux-iio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <tanghui20@...wei.com>, <zhangqiao22@...wei.com>,
	<judy.chenhui@...wei.com>, <quzicheng@...wei.com>
Subject: [PATCH] ad7780: fix division by zero in ad7780_write_raw()

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@...r.kernel.org>
Signed-off-by: Zicheng Qu <quzicheng@...wei.com>
---
 drivers/iio/adc/ad7780.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c
index e9b0c577c9cc..8ccb74f47030 100644
--- 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;
-- 
2.34.1