[PATCH 6.6.y] iio: gyro: adis16260: fix division by zero in write_raw

[Sasha Levin <sashal@kernel.org>]

From: Antoniu Miclaus <antoniu.miclaus@analog.com>

[ Upstream commit 761e8b489e6cf166c574034b70637f8a7eadd0ee ]

Add a validation check for the sampling frequency value before using it
as a divisor. A user writing zero to the sampling_frequency sysfs
attribute triggers a division by zero in the kernel.

Fixes: 089a41985c6c ("staging: iio: adis16260 digital gyro driver")
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/gyro/adis16260.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iio/gyro/adis16260.c b/drivers/iio/gyro/adis16260.c
index 112d635b7dfd3d..ffa7555ed4b54d 100644
--- a/drivers/iio/gyro/adis16260.c
+++ b/drivers/iio/gyro/adis16260.c
@@ -288,6 +288,9 @@ static int adis16260_write_raw(struct iio_dev *indio_dev,
 		addr = adis16260_addresses[chan->scan_index][1];
 		return adis_write_reg_16(adis, addr, val);
 	case IIO_CHAN_INFO_SAMP_FREQ:
+		if (val <= 0)
+			return -EINVAL;
+
 		adis_dev_lock(adis);
 		if (spi_get_device_id(adis->spi)->driver_data)
 			t = 256 / val;
-- 
2.53.0