linux-cve-announce - CVE-2024-49910: drm/amd/display: Add NULL check for function pointer in dcn401_set_output_transfer

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Message-ID: <2024102122-CVE-2024-49910-b56b@gregkh>
Date: Mon, 21 Oct 2024 20:01:58 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-49910: drm/amd/display: Add NULL check for function pointer in dcn401_set_output_transfer_func

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

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

drm/amd/display: Add NULL check for function pointer in dcn401_set_output_transfer_func

This commit adds a null check for the set_output_gamma function pointer
in the dcn401_set_output_transfer_func function. Previously,
set_output_gamma was being checked for null, but then it was being
dereferenced without any null check. This could lead to a null pointer
dereference if set_output_gamma is null.

To fix this, we now ensure that set_output_gamma is not null before
dereferencing it. We do this by adding a null check for set_output_gamma
before the call to set_output_gamma.

The Linux kernel CVE team has assigned CVE-2024-49910 to this issue.

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

	Fixed in 6.11.3 with commit d8ee900b92b6
	Fixed in 6.12-rc1 with commit dd340acd42c2

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-2024-49910
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/hwss/dcn401/dcn401_hwseq.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/d8ee900b92b6526cf84275b49a473155ad75c70e
	https://git.kernel.org/stable/c/dd340acd42c24a3f28dd22fae6bf38662334264c