[PATCH 3/6] drm: Verify gamma/degamma LUT size

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

While we want to potentially support multiple different gamma/degamma
LUT sizes we can (and should) at least check that the blob length
is a multiple of the LUT entry size.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/drm_atomic.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 8945357212ba..933edec0299d 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -413,6 +413,7 @@ drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
 					 struct drm_property_blob **blob,
 					 uint64_t blob_id,
 					 ssize_t expected_size,
+					 ssize_t expected_size_mod,
 					 bool *replaced)
 {
 	struct drm_property_blob *new_blob = NULL;
@@ -422,7 +423,13 @@ drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
 		if (new_blob == NULL)
 			return -EINVAL;
 
-		if (expected_size > 0 && expected_size != new_blob->length) {
+		if (expected_size > 0 &&
+		    new_blob->length != expected_size) {
+			drm_property_blob_put(new_blob);
+			return -EINVAL;
+		}
+		if (expected_size_mod > 0 &&
+		    new_blob->length % expected_size_mod != 0) {
 			drm_property_blob_put(new_blob);
 			return -EINVAL;
 		}
@@ -470,7 +477,7 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 		ret = drm_atomic_replace_property_blob_from_id(dev,
 					&state->degamma_lut,
 					val,
-					-1,
+					-1, sizeof(struct drm_color_lut),
 					&replaced);
 		state->color_mgmt_changed |= replaced;
 		return ret;
@@ -478,7 +485,7 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 		ret = drm_atomic_replace_property_blob_from_id(dev,
 					&state->ctm,
 					val,
-					sizeof(struct drm_color_ctm),
+					sizeof(struct drm_color_ctm), -1,
 					&replaced);
 		state->color_mgmt_changed |= replaced;
 		return ret;
@@ -486,7 +493,7 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 		ret = drm_atomic_replace_property_blob_from_id(dev,
 					&state->gamma_lut,
 					val,
-					-1,
+					-1, sizeof(struct drm_color_lut),
 					&replaced);
 		state->color_mgmt_changed |= replaced;
 		return ret;
-- 
2.13.6

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