linux-cve-announce - CVE-2023-53714: drm/stm: ltdc: fix late dereference check

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Message-ID: <2025102213-CVE-2023-53714-6b41@gregkh>
Date: Wed, 22 Oct 2025 15:24:53 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53714: drm/stm: ltdc: fix late dereference check

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

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

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

drm/stm: ltdc: fix late dereference check

In ltdc_crtc_set_crc_source(), struct drm_crtc was dereferenced in a
container_of() before the pointer check. This could cause a kernel panic.

Fix this smatch warning:
drivers/gpu/drm/stm/ltdc.c:1124 ltdc_crtc_set_crc_source() warn: variable dereferenced before check 'crtc' (see line 1119)

The Linux kernel CVE team has assigned CVE-2023-53714 to this issue.


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

	Fixed in 6.1.47 with commit 340dba127bbed51e8425cd8e097aacfadd175462
	Fixed in 6.4.12 with commit 04fe3b82528232aa85a6c45464906d0727ef4f20
	Fixed in 6.5 with commit 898a9e3f56db9860ab091d4bf41b6caa99aafc3d

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-2023-53714
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/stm/ltdc.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/340dba127bbed51e8425cd8e097aacfadd175462
	https://git.kernel.org/stable/c/04fe3b82528232aa85a6c45464906d0727ef4f20
	https://git.kernel.org/stable/c/898a9e3f56db9860ab091d4bf41b6caa99aafc3d