linux-cve-announce - CVE-2024-53201: drm/amd/display: Fix null check for pipe_ctx->plane_state in dcn20_program

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Message-ID: <2024122726-CVE-2024-53201-2534@gregkh>
Date: Fri, 27 Dec 2024 14:52:47 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53201: drm/amd/display: Fix null check for pipe_ctx->plane_state in dcn20_program_pipe

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

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

drm/amd/display: Fix null check for pipe_ctx->plane_state in dcn20_program_pipe

This commit addresses a null pointer dereference issue in
dcn20_program_pipe(). Previously, commit 8e4ed3cf1642 ("drm/amd/display:
Add null check for pipe_ctx->plane_state in dcn20_program_pipe")
partially fixed the null pointer dereference issue. However, in
dcn20_update_dchubp_dpp(), the variable pipe_ctx is passed in, and
plane_state is accessed again through pipe_ctx. Multiple if statements
directly call attributes of plane_state, leading to potential null
pointer dereference issues. This patch adds necessary null checks to
ensure stability.

The Linux kernel CVE team has assigned CVE-2024-53201 to this issue.


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

	Issue introduced in 6.11.3 with commit 65a6fee22d5cfa645cb05489892dc9cd3d142fc2 and fixed in 6.11.11 with commit 6b4ee2560d4d8de2688da68cd9581177035e0876
	Issue introduced in 6.12 with commit 8e4ed3cf1642df0c4456443d865cff61a9598aa8 and fixed in 6.12.2 with commit 3609259326171cd5b98462636580fb2ae5c87d40
	Issue introduced in 6.12 with commit 8e4ed3cf1642df0c4456443d865cff61a9598aa8 and fixed in 6.13-rc1 with commit 6a057072ddd127255350357dd880903e8fa23f36
	Issue introduced in 6.6.64 with commit 68f75e6f08aad66069a629db8d7840919156c761

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-2024-53201
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/dcn20/dcn20_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/6b4ee2560d4d8de2688da68cd9581177035e0876
	https://git.kernel.org/stable/c/3609259326171cd5b98462636580fb2ae5c87d40
	https://git.kernel.org/stable/c/6a057072ddd127255350357dd880903e8fa23f36