Subject: CVE-2022-48859: net: marvell: prestera: Add missing of_node_put() in prestera_switch_set_base_mac_addr

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

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

net: marvell: prestera: Add missing of_node_put() in prestera_switch_set_base_mac_addr

This node pointer is returned by of_find_compatible_node() with
refcount incremented. Calling of_node_put() to aovid the refcount leak.

The Linux kernel CVE team has assigned CVE-2022-48859 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 5.10 with commit 501ef3066c89 and fixed in 5.15.29 with commit b7c2fd1d1263
	Issue introduced in 5.10 with commit 501ef3066c89 and fixed in 5.16.15 with commit 4cc66bf17220
	Issue introduced in 5.10 with commit 501ef3066c89 and fixed in 5.17 with commit c9ffa3e2bc45

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-48859
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/net/ethernet/marvell/prestera/prestera_main.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/b7c2fd1d126329340639adfb8dd2938fe4b65df7
	https://git.kernel.org/stable/c/4cc66bf17220ff9631f9fa99b02a872e0ad5a08b
	https://git.kernel.org/stable/c/c9ffa3e2bc451816ce0295e40063514fabf2bd36