[PATCH 5.15.y 2/2] iio: chemical: scd30: fix division by zero in write_raw

[Sasha Levin <sashal@kernel.org>]

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

[ Upstream commit 5aba4f94b225617a55fed442a70329b2ee19c0a5 ]

Add a zero check for val2 before using it as a divisor when setting the
sampling frequency. A user writing a zero fractional part to the
sampling_frequency sysfs attribute triggers a division by zero in the
kernel.

Fixes: 64b3d8b1b0f5 ("iio: chemical: scd30: add core driver")
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/chemical/scd30_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/chemical/scd30_core.c b/drivers/iio/chemical/scd30_core.c
index a0a1f89deba913..26216154c8591b 100644
--- a/drivers/iio/chemical/scd30_core.c
+++ b/drivers/iio/chemical/scd30_core.c
@@ -257,7 +257,7 @@ static int scd30_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const
 	guard(mutex)(&state->lock);
 	switch (mask) {
 	case IIO_CHAN_INFO_SAMP_FREQ:
-		if (val)
+		if (val || !val2)
 			return -EINVAL;
 
 		val = 1000000000 / val2;
-- 
2.53.0