iio: adc: ti-ads7950: validate SPI match data

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.

ti_ads7950_probe() also obtains the IIO device name by dereferencing the
result of spi_get_device_id(), which is NULL on the same override path.
The probe can therefore crash before dereferencing the chip information.

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 and use the always available SPI
modalias for the IIO device name.

Fixes: ff0843ceb1fb ("iio: adc: ti-ads7950: remove chip_info[]")
Cc: stable@vger.kernel.org
Signed-off-by: Jiale Yao <yaojiale02@163.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions