linux-cve-announce - CVE-2024-53056: drm/mediatek: Fix potential NULL dereference in mtk_crtc

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Message-ID: <2024111928-CVE-2024-53056-ae69@gregkh>
Date: Tue, 19 Nov 2024 18:19:38 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53056: drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy()

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

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

drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy()

In mtk_crtc_create(), if the call to mbox_request_channel() fails then we
set the "mtk_crtc->cmdq_client.chan" pointer to NULL.  In that situation,
we do not call cmdq_pkt_create().

During the cleanup, we need to check if the "mtk_crtc->cmdq_client.chan"
is NULL first before calling cmdq_pkt_destroy().  Calling
cmdq_pkt_destroy() is unnecessary if we didn't call cmdq_pkt_create() and
it will result in a NULL pointer dereference.

The Linux kernel CVE team has assigned CVE-2024-53056 to this issue.


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

	Issue introduced in 5.17 with commit 7627122fd1c0 and fixed in 6.11.7 with commit c60583a87cb4
	Issue introduced in 5.17 with commit 7627122fd1c0 and fixed in 6.12 with commit 4018651ba5c4
	Issue introduced in 5.15.54 with commit 2c4396693698

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-2024-53056
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/mediatek/mtk_crtc.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/c60583a87cb4a85b69d1f448f0be5eb6ec62cbb2
	https://git.kernel.org/stable/c/4018651ba5c409034149f297d3dd3328b91561fd