linux-kernel - [PATCH v2 0/2] drm: display: Fix atomic check for HDMI connector disablement

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Message-Id: <20250110084821.3239518-1-victor.liu@nxp.com>
Date: Fri, 10 Jan 2025 16:48:19 +0800
From: Liu Ying <victor.liu@....com>
To: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: andrzej.hajda@...el.com,
	neil.armstrong@...aro.org,
	rfoss@...nel.org,
	Laurent.pinchart@...asonboard.com,
	jonas@...boo.se,
	jernej.skrabec@...il.com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	dmitry.baryshkov@...aro.org
Subject: [PATCH v2 0/2] drm: display: Fix atomic check for HDMI connector disablement

Hi,

This patch series fixes a potential NULL pointer dereference when using
drm_atomic_helper_connector_hdmi_check() to check a DRM atomic commit
which tries to disable a HDMI connector.

Patch 1 adds necessary checks to avoid the potential NULL pointer dereference.
Patch 2 adds a KUnit test case to make sure that atomic check succeeds when
disabling a HDMI connector.

Patch 1 is tested with i.MX8MP imx-lcdif, but not tested with sun4i and
rockchip due to no HW access.

v2:
* Trim backtrace in patch 1's commit message. (Dmitry)
* Drop timestamps from backtrace in patch 1's commit message. (Dmitry)
* Move the necessary checks from drm_bridge_connector_atomic_check() to
  drm_atomic_helper_connector_hdmi_check(). (Dmitry)
* Add the KUnit test case in patch 2. (Dmitry)

Liu Ying (2):
  drm/connector: hdmi: Do atomic check when necessary
  drm/tests: hdmi: Add connector disablement test

 .../gpu/drm/display/drm_hdmi_state_helper.c   |  3 ++
 .../drm/tests/drm_hdmi_state_helper_test.c    | 52 +++++++++++++++++++
 2 files changed, 55 insertions(+)

-- 
2.34.1