CVE-2022-48975

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

gpiolib: fix memory leak in gpiochip_setup_dev()

Here is a backtrace report about memory leak detected in

gpiochip_setup_dev():

unreferenced object 0xffff88810b406400 (size 512):

comm "python3", pid 1682, jiffies 4295346908 (age 24.090s)

backtrace:

kmalloc_trace

device_add device_private_init at drivers/base/core.c:3361

(inlined by) device_add at drivers/base/core.c:3411

cdev_device_add

gpiolib_cdev_register

gpiochip_setup_dev

gpiochip_add_data_with_key

gcdev_register() & gcdev_unregister() would call device_add() &

device_del() (no matter CONFIG_GPIO_CDEV is enabled or not) to

register/unregister device.

However, if device_add() succeeds, some resource (like

struct device_private allocated by device_private_init())

is not released by device_del().

Therefore, after device_add() succeeds by gcdev_register(), it

needs to call put_device() to release resource in the error handle

path.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References