linux-cve-announce - CVE-2022-48843: drm/vrr: Set VRR capable prop only if it is attached to connector

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Message-ID: <2024071623-CVE-2022-48843-b23b@gregkh>
Date: Tue, 16 Jul 2024 14:27:28 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-48843: drm/vrr: Set VRR capable prop only if it is attached to connector

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

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

drm/vrr: Set VRR capable prop only if it is attached to connector

VRR capable property is not attached by default to the connector
It is attached only if VRR is supported.
So if the driver tries to call drm core set prop function without
it being attached that causes NULL dereference.

The Linux kernel CVE team has assigned CVE-2022-48843 to this issue.


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

	Fixed in 5.4.186 with commit 941e8bcd2b2b
	Fixed in 5.10.107 with commit 0ba557d33094
	Fixed in 5.15.30 with commit 3534c5c005ef
	Fixed in 5.16.16 with commit 85271e92ae4f
	Fixed in 5.17 with commit 62929726ef0e

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-2022-48843
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_connector.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/941e8bcd2b2ba95490738e33dfeca27168452779
	https://git.kernel.org/stable/c/0ba557d330946c23559aaea2d51ea649fdeca98a
	https://git.kernel.org/stable/c/3534c5c005ef99a1804ed50b8a72cdae254cabb5
	https://git.kernel.org/stable/c/85271e92ae4f13aa679acaa6cf76b3c36bcb7bab
	https://git.kernel.org/stable/c/62929726ef0ec72cbbe9440c5d125d4278b99894