CVE-2022-49342: net: ethernet: bgmac: Fix refcount leak in bcma_mdio_mii_register

CVE-2022-49342: net: ethernet: bgmac: Fix refcount leak in bcma_mdio_mii_register

[Greg Kroah-Hartman]

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

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

net: ethernet: bgmac: Fix refcount leak in bcma_mdio_mii_register

of_get_child_by_name() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.

The Linux kernel CVE team has assigned CVE-2022-49342 to this issue.


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

	Issue introduced in 4.8 with commit 55954f3bfdacc5908515b0c306cea23e77fab740 and fixed in 5.17.15 with commit b51996e35bbfcc7a27d94dfeed5cc2429b2c0df4
	Issue introduced in 4.8 with commit 55954f3bfdacc5908515b0c306cea23e77fab740 and fixed in 5.18.4 with commit 7fb1fe7d9a167205413f1de8db9f7d0f82c78286
	Issue introduced in 4.8 with commit 55954f3bfdacc5908515b0c306cea23e77fab740 and fixed in 5.19 with commit b8d91399775c55162073bb2aca061ec42e3d4bc1

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-2022-49342
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/broadcom/bgmac-bcma-mdio.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/b51996e35bbfcc7a27d94dfeed5cc2429b2c0df4
	https://git.kernel.org/stable/c/7fb1fe7d9a167205413f1de8db9f7d0f82c78286
	https://git.kernel.org/stable/c/b8d91399775c55162073bb2aca061ec42e3d4bc1