linux-cve-announce - CVE-2024-56369: drm/modes: Avoid divide by zero harder in drm_mode

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Message-ID: <2025011146-CVE-2024-56369-be56@gregkh>
Date: Sat, 11 Jan 2025 13:35:58 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56369: drm/modes: Avoid divide by zero harder in drm_mode_vrefresh()

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

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

drm/modes: Avoid divide by zero harder in drm_mode_vrefresh()

drm_mode_vrefresh() is trying to avoid divide by zero
by checking whether htotal or vtotal are zero. But we may
still end up with a div-by-zero of vtotal*htotal*...

The Linux kernel CVE team has assigned CVE-2024-56369 to this issue.


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

	Fixed in 5.15.176 with commit e7c7b48a0fc5ed83baae400a1b15e33978c25d7f
	Fixed in 6.1.122 with commit 69fbb01e891701e6d04db1ddb5ad49e42c4dd963
	Fixed in 6.6.68 with commit b39de5a71bac5641d0fda33d1cf5682d82cf1ae5
	Fixed in 6.12.7 with commit 47c8b6cf1d08f0ad40d7ea7b025442e51b35ee1f
	Fixed in 6.13-rc4 with commit 9398332f23fab10c5ec57c168b44e72997d6318e

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-2024-56369
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/drm_modes.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/e7c7b48a0fc5ed83baae400a1b15e33978c25d7f
	https://git.kernel.org/stable/c/69fbb01e891701e6d04db1ddb5ad49e42c4dd963
	https://git.kernel.org/stable/c/b39de5a71bac5641d0fda33d1cf5682d82cf1ae5
	https://git.kernel.org/stable/c/47c8b6cf1d08f0ad40d7ea7b025442e51b35ee1f
	https://git.kernel.org/stable/c/9398332f23fab10c5ec57c168b44e72997d6318e