From: Zicheng Qu quzicheng@huawei.com

stable inclusion from stable-v6.6.64 commit 7e3a8ea3d1ada7f707de5d9d504774b4191eab66 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IBEAMC CVE: CVE-2024-56567

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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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: 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 Signed-off-by: ZhangPeng zhangpeng362@huawei.com Signed-off-by: Liao Chen liaochen4@huawei.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 a813fe04787c..97b6774e7f58 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;