linux-cve-announce - CVE-2022-50188: drm/meson: Fix refcount leak in meson_encoder_hdmi

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Message-ID: <2025061835-CVE-2022-50188-926e@gregkh>
Date: Wed, 18 Jun 2025 13:04:13 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50188: drm/meson: Fix refcount leak in meson_encoder_hdmi_init

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

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

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

drm/meson: Fix refcount leak in meson_encoder_hdmi_init

of_find_device_by_node() takes reference, we should use put_device()
to release it when not need anymore.
Add missing put_device() in error path to avoid refcount
leak.

The Linux kernel CVE team has assigned CVE-2022-50188 to this issue.


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

	Issue introduced in 5.17 with commit 0af5e0b41110e2da872030395231ab19c45be931 and fixed in 5.18.18 with commit 79b15eb0aa059b3a5bc60364ce82eb2cefac80db
	Issue introduced in 5.17 with commit 0af5e0b41110e2da872030395231ab19c45be931 and fixed in 5.19.2 with commit bfcca6234b2a36d213f0cc1c127becc17680f7df
	Issue introduced in 5.17 with commit 0af5e0b41110e2da872030395231ab19c45be931 and fixed in 6.0 with commit 7381076809586528e2a812a709e2758916318a99

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-2022-50188
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_hdmi.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/50446ac34545580d073ff0dd154b796726772668
	https://git.kernel.org/stable/c/79b15eb0aa059b3a5bc60364ce82eb2cefac80db
	https://git.kernel.org/stable/c/bfcca6234b2a36d213f0cc1c127becc17680f7df
	https://git.kernel.org/stable/c/7381076809586528e2a812a709e2758916318a99