[PATCH 1/4] iio: accel: adxl313: reject devices without match data

[Jiale Yao]

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.

adxl313_spi_probe() dereferences chip_data to select the regmap
configuration, 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 selecting the configuration.

Fixes: d6e3ee74d16f ("iio: accel: adxl313: simplify with spi_get_device_match_data()")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/iio/accel/adxl313_spi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/accel/adxl313_spi.c b/drivers/iio/accel/adxl313_spi.c
index a61295de104f..0f0da44461f7 100644
--- a/drivers/iio/accel/adxl313_spi.c
+++ b/drivers/iio/accel/adxl313_spi.c
@@ -79,6 +79,8 @@ static int adxl313_spi_probe(struct spi_device *spi)
 		return ret;
 
 	chip_data = spi_get_device_match_data(spi);
+	if (!chip_data)
+		return -ENODATA;
 
 	regmap = devm_regmap_init_spi(spi,
 				      &adxl31x_spi_regmap_config[chip_data->type]);
-- 
2.34.1