From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
KASAN report null-ptr-deref as follows:
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 282 Comm: python3 Tainted: G N 6.0.0-rc7-next-20220927+ #153
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:ltc2497core_probe+0x77/0x440 [ltc2497_core]
Call Trace:
<TASK>
ltc2496_probe+0xf4/0x150
spi_probe+0x158/0x1f0 drivers/spi/spi.c:421
call_driver_probe drivers/base/dd.c:560 [inline]
really_probe+0x207/0x750 drivers/base/dd.c:639
__driver_probe_device+0x229/0x2a0 drivers/base/dd.c:778
device_driver_attach+0xb8/0x1e0 drivers/base/dd.c:1105
This happend when probe ltc2496 device with spi device id but without
dts, device_get_match_data() return null chip_info. Fix it by adding
null check for chip_info in ltc2496_probe().
Fixes: 1695c52a1260 ("drivers: iio: adc: ltc2497: Rename the LTC2499 iio device")
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
diff --git a/drivers/iio/adc/ltc2496.c b/drivers/iio/adc/ltc2496.c
index 2593fa4322eb..a7353c3dd006 100644
--- a/drivers/iio/adc/ltc2496.c
+++ b/drivers/iio/adc/ltc2496.c
@@ -76,6 +76,8 @@ static int ltc2496_probe(struct spi_device *spi)
st->spi = spi;
st->common_ddata.result_and_measure = ltc2496_result_and_measure;
st->common_ddata.chip_info = device_get_match_data(dev);
+ if (!st->common_ddata.chip_info)
+ return -ENODEV;
return ltc2497core_probe(dev, indio_dev);
}
--
2.34.1
