CVE-2022-49285 Information

Description

In the Linux kernel the following vulnerability has been resolved:

iio: accel: mma8452: use the correct logic to get mma8452_data

The original logic to get mma8452_data is wrong the dev point to the device belong to iio_dev. we can’t use this dev to find the correct i2c_client. The original logic happen to work because it finally use dev->driver_data to get iio_dev. Here use the API to_i2c_client() is wrong and make reader confuse. To correct the logic it should be like this

struct mma8452_data data = iio_priv(dev_get_drvdata(dev));

But after commit 8b7651f25962 (\iio: iio_device_alloc(): Remove unnecessary self drvdata) the upper logic also can’t work. When try to show the avialable scale in userspace will meet kernel dump kernel handle NULL pointer dereference.

So use dev_to_iio_dev() to correct the logic.

Dual fixes tags as the second reflects when the bug was exposed whilst the first reflects when the original bug was introduced.

Reference

https://git.kernel.org/stable/c/4c0bb583a4444cce224e8661090cbffc98e2fe07 https://git.kernel.org/stable/c/c87b7b12f48db86ac9909894f4dc0107d7df6375 https://git.kernel.org/stable/c/d2d9ebdbff79d87d27652578e6d1638ad3b5f3bf