Re: [Intel-gfx] [PATCH 3/6] drm: Verify gamma/degamma LUT size

Regards

Shashank

On 2/24/2018 12:55 AM, Ville Syrjala wrote:

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.

I dint understand the exact idea behind doing this, how is this going to benefit ? May be a bit more description ?

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;
  

• }
  

One line needed here, matching the previous if() pattern

• 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;