linux-cve-announce - CVE-2025-21819: Revert "drm/amd/display: Use HW lock mgr for PSR1"

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Message-ID: <2025022710-CVE-2025-21819-5549@gregkh>
Date: Thu, 27 Feb 2025 12:03:16 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21819: Revert "drm/amd/display: Use HW lock mgr for PSR1"

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

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

Revert "drm/amd/display: Use HW lock mgr for PSR1"

This reverts commit
a2b5a9956269 ("drm/amd/display: Use HW lock mgr for PSR1")

Because it may cause system hang while connect with two edp panel.

The Linux kernel CVE team has assigned CVE-2025-21819 to this issue.


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

	Fixed in 6.1.129 with commit 915697c2e69ac8d14dad498e6d6f43dbb7de3787
	Fixed in 6.6.78 with commit dcc3f2c06d80da39eee742b51ddf0781affb260c
	Fixed in 6.12.14 with commit 95c75578c420110c43791295985abb961d6dc033
	Fixed in 6.13.3 with commit a978864653e45d2671f99b09afcc1110e45d3dd9
	Fixed in 6.14-rc2 with commit f245b400a223a71d6d5f4c72a2cb9b573a7fc2b6

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-2025-21819
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/dce/dmub_hw_lock_mgr.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/915697c2e69ac8d14dad498e6d6f43dbb7de3787
	https://git.kernel.org/stable/c/dcc3f2c06d80da39eee742b51ddf0781affb260c
	https://git.kernel.org/stable/c/95c75578c420110c43791295985abb961d6dc033
	https://git.kernel.org/stable/c/a978864653e45d2671f99b09afcc1110e45d3dd9
	https://git.kernel.org/stable/c/f245b400a223a71d6d5f4c72a2cb9b573a7fc2b6