drm/radeon/kms: Forbid creation of framebuffer with no valid GEM object

This will avoid oops if at later point the fb is use. Trying to create
a framebuffer with no valid GEM object is bogus and should be forbidden
as this patch does.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 49f3c69cf240..f899320f0a6b 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -715,7 +715,11 @@ radeon_user_framebuffer_create(struct drm_device *dev,
         struct drm_gem_object *obj;
 
         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handle);
-
+        if (obj ==  NULL) {
+                dev_err(&dev->pdev->dev, "No GEM object associated to handle 0x%08X, "
+                        "can't create framebuffer\n", mode_cmd->handle);
+                return NULL;
+        }
         return radeon_framebuffer_create(dev, mode_cmd, obj);
 }