iio: adc: mcp3911: reject devices without 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.

mcp3911_probe() stores the result and later calls through chip->config
and accesses other chip-specific fields, 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 continuing the probe.

Fixes: 732ad34260d3 ("iio: adc: mcp3911: add support for the whole MCP39xx family")
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