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drm: Verify gamma/degamma LUT size 

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.

v2: s/expected_size_mod/expected_elem_size/ (Daniel)
    Add kernel doc (Daniel)
v3: s/we/were/ typo in the docs

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180315152241.7113-1-ville.syrjala@linux.intel.com
hifive-unleashed-5.1
Ville Syrjälä 2018-03-15 17:22:41 +02:00
parent 11b83e3fbc
commit d2a24edb53
2 changed files with 38 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/gpu/drm-kms.rst
View File

@ -286,6 +286,9 @@ Atomic Mode Setting Function Reference
.. kernel-doc:: drivers/gpu/drm/drm_atomic.c
:export:
.. kernel-doc:: drivers/gpu/drm/drm_atomic.c
:internal:
CRTC Abstraction
================

39
drivers/gpu/drm/drm_atomic.c
View File

@ -408,11 +408,36 @@ int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
}
EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
/**
* drm_atomic_replace_property_blob_from_id - lookup the new blob and replace the old one with it
* @dev: DRM device
* @blob: a pointer to the member blob to be replaced
* @blob_id: ID of the new blob
* @expected_size: total expected size of the blob data (in bytes)
* @expected_elem_size: expected element size of the blob data (in bytes)
* @replaced: did the blob get replaced?
*
* Replace @blob with another blob with the ID @blob_id. If @blob_id is zero
* @blob becomes NULL.
*
* If @expected_size is positive the new blob length is expected to be equal
* to @expected_size bytes. If @expected_elem_size is positive the new blob
* length is expected to be a multiple of @expected_elem_size bytes. Otherwise
* an error is returned.
*
* @replaced will indicate to the caller whether the blob was replaced or not.
* If the old and new blobs were in fact the same blob @replaced will be false
* otherwise it will be true.
*
* RETURNS:
* Zero on success, error code on failure.
*/
static int
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_elem_size,
bool *replaced)
{
struct drm_property_blob *new_blob = NULL;
@ -422,7 +447,13 @@ 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_elem_size > 0 &&
new_blob->length % expected_elem_size != 0) {
drm_property_blob_put(new_blob);
return -EINVAL;
}
@ -470,7 +501,7 @@ 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 +509,7 @@ 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 +517,7 @@ 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;