udl: add prime fd->handle support.

udl can only be used as an output offload so doesn't need to support
handle->fd direction.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index 4d9c3a5d8a45..a029ee39b0c5 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -593,11 +593,20 @@ udl_fb_user_fb_create(struct drm_device *dev,
         struct drm_gem_object *obj;
         struct udl_framebuffer *ufb;
         int ret;
+        uint32_t size;
 
         obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
         if (obj == NULL)
                 return ERR_PTR(-ENOENT);
 
+        size = mode_cmd->pitches[0] * mode_cmd->height;
+        size = ALIGN(size, PAGE_SIZE);
+
+        if (size > obj->size) {
+                DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
+                return ERR_PTR(-ENOMEM);
+        }
+
         ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
         if (ufb == NULL)
                 return ERR_PTR(-ENOMEM);