Memory Leak Affecting kernel-rt-devel-matched package, versions *


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-RHEL9-KERNELRTDEVELMATCHED-8252642
  • published23 Oct 2024
  • disclosed21 Oct 2024

Introduced: 21 Oct 2024

CVE-2022-48975  (opens in a new tab)
CWE-401  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:9 kernel-rt-devel-matched.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-devel-matched package and not the kernel-rt-devel-matched package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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.

Here we move forward the register of release function, and let it release every piece of resource by put_device() instead of kfree().

While at it, fix another subtle issue, i.e. when gc->ngpio is equal to 0, we still call kcalloc() and, in case of further error, kfree() on the ZERO_PTR pointer, which is not NULL. It's not a bug per se, but rather waste of the resources and potentially wrong expectation about contents of the gdev->descs variable.

CVSS Scores

version 3.1