[PATCH 6/7] iio: potentiometer: x9250: reject devices without match data

[Jiale Yao <yaojiale02@163.com>]

A device bound through driver_override need not match an entry in the
driver tables. In that case spi_get_device_match_data() returns NULL,
but x9250_probe() later dereferences the result while naming the IIO
device.

Reject devices without match data before enabling the regulators.

Fixes: 66bfc528a6fd ("iio: potentiometer: Add support for the Renesas X9250 potentiometers")
Signed-off-by: Jiale Yao <yaojiale02@163.com>
---
 drivers/iio/potentiometer/x9250.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/potentiometer/x9250.c b/drivers/iio/potentiometer/x9250.c
index 974e4447fc2c..675b78677baa 100644
--- a/drivers/iio/potentiometer/x9250.c
+++ b/drivers/iio/potentiometer/x9250.c
@@ -155,10 +155,15 @@ static const char *const x9250_regulator_names[] = {
 
 static int x9250_probe(struct spi_device *spi)
 {
+	const struct x9250_cfg *cfg;
 	struct iio_dev *indio_dev;
 	struct x9250 *x9250;
 	int ret;
 
+	cfg = spi_get_device_match_data(spi);
+	if (!cfg)
+		return -ENODATA;
+
 	ret = devm_regulator_bulk_get_enable(&spi->dev, ARRAY_SIZE(x9250_regulator_names),
 					     x9250_regulator_names);
 	if (ret)
@@ -176,7 +181,7 @@ static int x9250_probe(struct spi_device *spi)
 
 	x9250 = iio_priv(indio_dev);
 	x9250->spi = spi;
-	x9250->cfg = spi_get_device_match_data(spi);
+	x9250->cfg = cfg;
 	x9250->wp_gpio = devm_gpiod_get_optional(&spi->dev, "wp", GPIOD_OUT_LOW);
 	if (IS_ERR(x9250->wp_gpio))
 		return dev_err_probe(&spi->dev, PTR_ERR(x9250->wp_gpio),
-- 
2.34.1