[PATCH 8/9] iio: adc: ti-ads131m02: 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.

ads131m_probe() immediately dereferences the returned configuration to
initialize the IIO device, 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 configuration.

Fixes: 4aa91223fd6c ("iio: adc: Add TI ADS131M0x ADC driver")
Cc: stable@vger.kernel.org
Signed-off-by: Jiale Yao <yaojiale02@163.com>
---
 drivers/iio/adc/ti-ads131m02.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/adc/ti-ads131m02.c b/drivers/iio/adc/ti-ads131m02.c
index 2f8f75c8216b..7ecfb27fd7ef 100644
--- a/drivers/iio/adc/ti-ads131m02.c
+++ b/drivers/iio/adc/ti-ads131m02.c
@@ -897,6 +897,8 @@ static int ads131m_probe(struct spi_device *spi)
 	indio_dev->info = &ads131m_info;
 
 	config = spi_get_device_match_data(spi);
+	if (!config)
+		return -ENODATA;
 
 	priv->config = config;
 	indio_dev->name = config->name;
-- 
2.34.1