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Message-Id: <20251115-drm-fix-lut-checks-v1-2-3586f5855bc7@oss.qualcomm.com>
Date: Sat, 15 Nov 2025 05:42:50 +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 2/3] drm/atomic: add max_size check to
drm_property_replace_blob_from_id()
The function drm_property_replace_blob_from_id() allows checking whether
the blob size is equal to a predefined value. In case of variable-size
properties (like the gamma / degamma LUTs) we might want to check for
the blob size against the maximum, allowing properties of the size
lesser than the max supported by the hardware. Extend the function in
order to support such checks.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 5 +++++
drivers/gpu/drm/drm_atomic_uapi.c | 7 +++++--
drivers/gpu/drm/drm_property.c | 11 +++++++++++
include/drm/drm_property.h | 1 +
4 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index e027798ece03226338a4ff6ca9e06eb77436bac4..d19631b5d9e1237849e081b156d23b933848faef 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -1677,6 +1677,7 @@ dm_atomic_plane_set_property(struct drm_plane *plane,
&dm_plane_state->degamma_lut,
val, -1,
sizeof(struct drm_color_lut),
+ 0,
&replaced);
dm_plane_state->base.color_mgmt_changed |= replaced;
return ret;
@@ -1695,6 +1696,7 @@ dm_atomic_plane_set_property(struct drm_plane *plane,
&dm_plane_state->ctm,
val,
sizeof(struct drm_color_ctm_3x4), -1,
+ 0,
&replaced);
dm_plane_state->base.color_mgmt_changed |= replaced;
return ret;
@@ -1703,6 +1705,7 @@ dm_atomic_plane_set_property(struct drm_plane *plane,
&dm_plane_state->shaper_lut,
val, -1,
sizeof(struct drm_color_lut),
+ 0,
&replaced);
dm_plane_state->base.color_mgmt_changed |= replaced;
return ret;
@@ -1716,6 +1719,7 @@ dm_atomic_plane_set_property(struct drm_plane *plane,
&dm_plane_state->lut3d,
val, -1,
sizeof(struct drm_color_lut),
+ 0,
&replaced);
dm_plane_state->base.color_mgmt_changed |= replaced;
return ret;
@@ -1724,6 +1728,7 @@ dm_atomic_plane_set_property(struct drm_plane *plane,
&dm_plane_state->blend_lut,
val, -1,
sizeof(struct drm_color_lut),
+ 0,
&replaced);
dm_plane_state->base.color_mgmt_changed |= replaced;
return ret;
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 85dbdaa4a2e25878c953b9b41539c8566d55c6d9..7d2076f1006e976de73c898a838ceb4b5c4370e4 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -388,6 +388,7 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
&state->degamma_lut,
val,
-1, sizeof(struct drm_color_lut),
+ 0,
&replaced);
state->color_mgmt_changed |= replaced;
return ret;
@@ -395,7 +396,7 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
ret = drm_property_replace_blob_from_id(dev,
&state->ctm,
val,
- sizeof(struct drm_color_ctm), -1,
+ sizeof(struct drm_color_ctm), -1, 0,
&replaced);
state->color_mgmt_changed |= replaced;
return ret;
@@ -404,6 +405,7 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
&state->gamma_lut,
val,
-1, sizeof(struct drm_color_lut),
+ 0,
&replaced);
state->color_mgmt_changed |= replaced;
return ret;
@@ -546,6 +548,7 @@ static int drm_atomic_plane_set_property(struct drm_plane *plane,
val,
-1,
sizeof(struct drm_mode_rect),
+ 0,
&replaced);
return ret;
} else if (property == plane->scaling_filter_property) {
@@ -741,7 +744,7 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
ret = drm_property_replace_blob_from_id(dev,
&state->hdr_output_metadata,
val,
- sizeof(struct hdr_output_metadata), -1,
+ sizeof(struct hdr_output_metadata), -1, 0,
&replaced);
return ret;
} else if (property == config->aspect_ratio_property) {
diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c
index 596272149a3599130186a470e5a5a3c1150b377d..5befe443135d3861289183d1b6fa1ac0e5e46515 100644
--- a/drivers/gpu/drm/drm_property.c
+++ b/drivers/gpu/drm/drm_property.c
@@ -759,6 +759,7 @@ EXPORT_SYMBOL(drm_property_replace_blob);
* @blob_id: the id of the new blob to replace with
* @expected_size: expected size of the blob property
* @expected_elem_size: expected size of an element in the blob property
+ * @max_size: the maximum size of the blob property for variable-size blobs
* @replaced: if the blob was in fact replaced
*
* Look up the new blob from id, take its reference, check expected sizes of
@@ -773,6 +774,7 @@ int drm_property_replace_blob_from_id(struct drm_device *dev,
uint64_t blob_id,
ssize_t expected_size,
ssize_t expected_elem_size,
+ ssize_t max_size,
bool *replaced)
{
struct drm_property_blob *new_blob = NULL;
@@ -801,6 +803,15 @@ int drm_property_replace_blob_from_id(struct drm_device *dev,
drm_property_blob_put(new_blob);
return -EINVAL;
}
+
+ if (max_size > 0 &&
+ new_blob->length > max_size) {
+ drm_dbg_atomic(dev,
+ "[BLOB:%d] length %zu greater than max %zu\n",
+ new_blob->base.id, new_blob->length, max_size);
+ drm_property_blob_put(new_blob);
+ return -EINVAL;
+ }
}
*replaced |= drm_property_replace_blob(blob, new_blob);
diff --git a/include/drm/drm_property.h b/include/drm/drm_property.h
index 082f29156b3e3fd2de0d6a3864022388cd61e17d..aa49b5a42bb56d9331d8d3397b150e33aae67451 100644
--- a/include/drm/drm_property.h
+++ b/include/drm/drm_property.h
@@ -284,6 +284,7 @@ int drm_property_replace_blob_from_id(struct drm_device *dev,
uint64_t blob_id,
ssize_t expected_size,
ssize_t expected_elem_size,
+ ssize_t max_size,
bool *replaced);
int drm_property_replace_global_blob(struct drm_device *dev,
struct drm_property_blob **replace,
--
2.47.3
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