linux-cve-announce - CVE-2022-50183: drm/meson: encoder_cvbs: Fix refcount leak in meson_encoder_cvbs

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Message-ID: <2025061833-CVE-2022-50183-07ec@gregkh>
Date: Wed, 18 Jun 2025 13:04:08 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50183: drm/meson: encoder_cvbs: Fix refcount leak in meson_encoder_cvbs_init

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

drm/meson: encoder_cvbs: Fix refcount leak in meson_encoder_cvbs_init

of_graph_get_remote_node() returns remote device nodepointer with
refcount incremented, we should use of_node_put() on it when done.
Add missing of_node_put() to avoid refcount leak.

The Linux kernel CVE team has assigned CVE-2022-50183 to this issue.


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

	Issue introduced in 5.17 with commit 318ba02cd8a8bacd20a4fe29edff3c0931d17ded and fixed in 5.18.18 with commit 51c36411ae27bf5f06c43462d2de2d4947ed33ea
	Issue introduced in 5.17 with commit 318ba02cd8a8bacd20a4fe29edff3c0931d17ded and fixed in 5.19.2 with commit bb5ac08d5bd8626c318bd80a5063263daab8fdb6
	Issue introduced in 5.17 with commit 318ba02cd8a8bacd20a4fe29edff3c0931d17ded and fixed in 6.0 with commit 7d255ddbbf679aa47e041cbf68520fd985ed2279

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-2022-50183
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/gpu/drm/meson/meson_encoder_cvbs.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/51c36411ae27bf5f06c43462d2de2d4947ed33ea
	https://git.kernel.org/stable/c/bb5ac08d5bd8626c318bd80a5063263daab8fdb6
	https://git.kernel.org/stable/c/7d255ddbbf679aa47e041cbf68520fd985ed2279