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iio: adc: ad7768-1: reject devices without match data

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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.

ad7768_probe() later dereferences the returned chip information to
initialize the IIO channels and device name, causing a NULL pointer
dereference.

Commit 572a008526 ("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: fa087f5bab ("iio: adc: ad7768-1: introduce chip info for future multidevice support")
Cc: stable@vger.kernel.org
Signed-off-by: Jiale Yao <yaojiale02@163.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
This commit is contained in:
Jiale Yao 2026-09-25 20:57:41 +08:00 committed by Jonathan Cameron
parent 7830650d52
commit e29630bd46
1 changed files with 3 additions and 0 deletions
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3
drivers/iio/adc/ad7768-1.c
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@ -1829,6 +1829,9 @@ static int ad7768_probe(struct spi_device *spi)
}
st->chip = spi_get_device_match_data(spi);
if (!st->chip)
return -ENODATA;
st->spi = spi;
st->regmap = devm_regmap_init_spi(spi, &ad7768_regmap_config);