linux-cve-announce - CVE-2025-38205: drm/amd/display: Avoid divide by zero by initializing dummy pitch to 1

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Message-ID: <2025070419-CVE-2025-38205-0316@gregkh>
Date: Fri,  4 Jul 2025 15:37:34 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38205: drm/amd/display: Avoid divide by zero by initializing dummy pitch to 1

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

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

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

drm/amd/display: Avoid divide by zero by initializing dummy pitch to 1

[Why]
If the dummy values in `populate_dummy_dml_surface_cfg()` aren't updated
then they can lead to a divide by zero in downstream callers like
CalculateVMAndRowBytes()

[How]
Initialize dummy value to a value to avoid divide by zero.

The Linux kernel CVE team has assigned CVE-2025-38205 to this issue.


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

	Fixed in 6.15.4 with commit 8044f981b2cf8c32fe1bd5d1fc991552cdf7ffe0
	Fixed in 6.16-rc1 with commit 7e40f64896e8e3dca471e287672db5ace12ea0be

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-2025-38205
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/dml2/dml2_translation_helper.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/8044f981b2cf8c32fe1bd5d1fc991552cdf7ffe0
	https://git.kernel.org/stable/c/7e40f64896e8e3dca471e287672db5ace12ea0be