[PATCH 4/4] iio: accel: sca3000: reject devices without match data

[Jiale Yao <yaojiale02@163.com>]

SPI driver_override allows a device to bind to this driver without
matching either the OF or SPI device ID table. In that case,
spi_get_device_match_data() returns NULL.

sca3000_probe() immediately dereferences the returned chip information
to set the IIO device name and channel layout, causing a NULL pointer
dereference.

Commit 572a00852635 ("iio: dac: ad5686: missing NULL check on match
data") fixed the same driver_override issue in another SPI driver.
Reject devices without match data before using the chip information.

Fixes: d6ae9f202f61 ("iio: sca3000: simplify with spi_get_device_match_data()")
Cc: stable@vger.kernel.org
Signed-off-by: Jiale Yao <yaojiale02@163.com>
---
 drivers/iio/accel/sca3000.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/accel/sca3000.c b/drivers/iio/accel/sca3000.c
index a92a563f6a4b..0d5ed244a663 100644
--- a/drivers/iio/accel/sca3000.c
+++ b/drivers/iio/accel/sca3000.c
@@ -1462,6 +1462,8 @@ static int sca3000_probe(struct spi_device *spi)
 	st->us = spi;
 	mutex_init(&st->lock);
 	st->info = spi_get_device_match_data(spi);
+	if (!st->info)
+		return -ENODATA;
 
 	indio_dev->name = st->info->name;
 	indio_dev->info = &sca3000_info;
-- 
2.34.1