CVE-2022-49016 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net: mdiobus: fix unbalanced node reference count

I got the following report while doing device(mscc-miim) load test with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:

OF: ERROR: memory leak expected refcount 1 instead of 2 of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/soc@0/mdio@7107009c/ethernet-phy@0

If the ‘fwnode’ is not an acpi node the refcount is get in fwnode_mdiobus_phy_device_register() but it has never been put when the device is freed in the normal path. So call fwnode_handle_put() in phy_device_release() to avoid leak.

If it’s an acpi node it has never been get but it’s put in the error path so call fwnode_handle_get() before phy_device_register() to keep get/put operation balanced.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

https://git.kernel.org/stable/c/543d917f691ab06885ee779c862065899eaa4251 https://git.kernel.org/stable/c/2708b357440427d6a9fee667eb7b8307f4625adc https://git.kernel.org/stable/c/cdde1560118f82498fc9e9a7c1ef7f0ef7755891

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5