linux-kernel - [PATCH v3 0/3] drm/atomic: restrict the size of of gamma / degamma LUTs

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Message-Id: <20260106-drm-fix-lut-checks-v3-0-f7f979eb73c8@oss.qualcomm.com>
Date: Tue, 06 Jan 2026 05:09:54 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <siqueira@...lia.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org
Subject: [PATCH v3 0/3] drm/atomic: restrict the size of of gamma / degamma
 LUTs

While picking up the Gamma correction patch for the msm driver I noticed
that kms_color@...alid-gamma-lut-sizes and
kms_color@...alid-degamma-lut-sizes tests fail. These tests attempt
submitting LUT tables greater than the size specified by the
corresponding property. The issue doesn't seem to be specific to msm
driver only. Add generic check that LUT size is not greater than the
size passed to drm_crtc_enable_color_mgmt().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Changes in v3:
- Fixed elem_size type (LKP)
- Link to v2: https://lore.kernel.org/r/20251228-drm-fix-lut-checks-v2-0-50f5d1a260a7@oss.qualcomm.com

Changes in v2:
- Fixed comments for drm_object_immutable_property_get_value(), changed
  it to use drm_WARN_ON (Thomas)
- Reordered arguments of drm_property_replace_blob_from_id(), moving
  max_size before expected_size (Thomas)
- Link to v1: https://lore.kernel.org/r/20251115-drm-fix-lut-checks-v1-0-3586f5855bc7@oss.qualcomm.com,
  resent at https://lore.kernel.org/all/20251210-drm-fix-lut-checks-v1-0-10ae38519f43@oss.qualcomm.com/

---
Dmitry Baryshkov (3):
      drm/mode_object: add drm_object_immutable_property_get_value()
      drm/atomic: add max_size check to drm_property_replace_blob_from_id()
      drm/atomic: verify that gamma/degamma LUTs are not too big

 .../drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c    | 18 ++++++------
 drivers/gpu/drm/drm_atomic_uapi.c                  | 32 ++++++++++++++++------
 drivers/gpu/drm/drm_mode_object.c                  | 25 +++++++++++++++++
 drivers/gpu/drm/drm_property.c                     | 11 ++++++++
 include/drm/drm_mode_object.h                      |  3 ++
 include/drm/drm_property.h                         |  1 +
 6 files changed, 73 insertions(+), 17 deletions(-)
---
base-commit: 349d4efadc1f831ebc0b872ba1e3a2b7dd58b72b
change-id: 20251114-drm-fix-lut-checks-4bb325e24110

Best regards,
-- 
With best wishes
Dmitry