linux-cve-announce - CVE-2022-49969: drm/amd/display: clear optc underflow before turn off odm clock

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Message-ID: <2025061816-CVE-2022-49969-fd54@gregkh>
Date: Wed, 18 Jun 2025 13:00:34 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49969: drm/amd/display: clear optc underflow before turn off odm clock

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

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

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

drm/amd/display: clear optc underflow before turn off odm clock

[Why]
After ODM clock off, optc underflow bit will be kept there always and clear not work.
We need to clear that before clock off.

[How]
Clear that if have when clock off.

The Linux kernel CVE team has assigned CVE-2022-49969 to this issue.


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

	Fixed in 4.19.257 with commit 443687798d6f094412b7312b64b3bb4d99aedff7
	Fixed in 5.4.212 with commit 814b756d4ec3a8728debb116cf49005feada7750
	Fixed in 5.10.141 with commit 3c1dfeaeb3b4e3ea656041da1241e6ee3c3b3202
	Fixed in 5.15.65 with commit 5ee30bcfdb32526233d2572f3d9ec371928679f1
	Fixed in 5.19.7 with commit 3101839b080137c367f3f88c2a040f791de880aa
	Fixed in 6.0 with commit b2a93490201300a749ad261b5c5d05cb50179c44

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-2022-49969
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/amd/display/dc/dcn10/dcn10_optc.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/443687798d6f094412b7312b64b3bb4d99aedff7
	https://git.kernel.org/stable/c/814b756d4ec3a8728debb116cf49005feada7750
	https://git.kernel.org/stable/c/3c1dfeaeb3b4e3ea656041da1241e6ee3c3b3202
	https://git.kernel.org/stable/c/5ee30bcfdb32526233d2572f3d9ec371928679f1
	https://git.kernel.org/stable/c/3101839b080137c367f3f88c2a040f791de880aa
	https://git.kernel.org/stable/c/b2a93490201300a749ad261b5c5d05cb50179c44