> -----Original Message-----
> From: Wei Yongjun <weiyongjun@xxxxxxxxxxxxxxx>
> Sent: Wednesday, September 28, 2022 6:10 AM
> To: Lars-Peter Clausen <lars@xxxxxxxxxx>; Hennerich, Michael
> <Michael.Hennerich@xxxxxxxxxx>; Jonathan Cameron <jic23@xxxxxxxxxx>;
> Regus, Ciprian <Ciprian.Regus@xxxxxxxxxx>
> Cc: Wei Yongjun <weiyongjun1@xxxxxxxxxx>; linux-iio@xxxxxxxxxxxxxxx
> Subject: [PATCH] iio: adc: ltc2496: Fix possible null-ptr-deref in
> ltc2496_probe()
>
> [External]
>
> 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>
>
Thanks!
Reviewed-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
