[PATCH 2/4] iio: accel: adxl372: 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.

adxl372_spi_probe() passes the result to adxl372_probe(), which
dereferences chip_info to set the IIO device name and capabilities,
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 in the SPI frontend.

Fixes: 23d742859a2d ("iio: accel: adxl372: introduce chip_info structure")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/iio/accel/adxl372_spi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/accel/adxl372_spi.c b/drivers/iio/accel/adxl372_spi.c
index 128e148c4e96..d54544d6df6f 100644
--- a/drivers/iio/accel/adxl372_spi.c
+++ b/drivers/iio/accel/adxl372_spi.c
@@ -25,6 +25,8 @@ static int adxl372_spi_probe(struct spi_device *spi)
 	struct regmap *regmap;
 
 	chip_info = spi_get_device_match_data(spi);
+	if (!chip_info)
+		return -ENODATA;
 
 	regmap = devm_regmap_init_spi(spi, &adxl372_spi_regmap_config);
 	if (IS_ERR(regmap))
-- 
2.34.1