The kernel specifies LUT table sizes in a separate property, however it
doesn't enforce it as a maximum. Some drivers implement max suze check
on their own in the atomic_check path. Other drivers simply ignore the
issue. Perform LUT size validation in the generic place.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/drm_atomic_uapi.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 7d2076f1006e..178d983b2378 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -384,11 +384,19 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 	} else if (property == config->prop_vrr_enabled) {
 		state->vrr_enabled = val;
 	} else if (property == config->degamma_lut_property) {
+		u64 lut_size;
+
+		ret = drm_object_immutable_property_get_value(&crtc->base,
+							      config->degamma_lut_size_property,
+							      &lut_size);
+		if (ret)
+			return ret;
+
 		ret = drm_property_replace_blob_from_id(dev,
 					&state->degamma_lut,
 					val,
 					-1, sizeof(struct drm_color_lut),
-					0,
+					sizeof(struct drm_color_lut) * lut_size,
 					&replaced);
 		state->color_mgmt_changed |= replaced;
 		return ret;
@@ -401,11 +409,19 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 		state->color_mgmt_changed |= replaced;
 		return ret;
 	} else if (property == config->gamma_lut_property) {
+		u64 lut_size;
+
+		ret = drm_object_immutable_property_get_value(&crtc->base,
+							      config->gamma_lut_size_property,
+							      &lut_size);
+		if (ret)
+			return ret;
+
 		ret = drm_property_replace_blob_from_id(dev,
 					&state->gamma_lut,
 					val,
 					-1, sizeof(struct drm_color_lut),
-					0,
+					sizeof(struct drm_color_lut) * lut_size,
 					&replaced);
 		state->color_mgmt_changed |= replaced;
 		return ret;

-- 
2.47.3