drm/gem: drm_gem_dumb_map_offset(): reject dma-buf

Reject mapping an imported dma-buf since is's an invalid use-case.

Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Eric Anholt <eric@anholt.net>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1502986891-36764-2-git-send-email-noralf@tronnes.org

drivers/gpu/drm/drm_gem.c

@@ -333,6 +333,12 @@ int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 	if (!obj)
 		return -ENOENT;
 
+	/* Don't allow imported objects to be mapped */
+	if (obj->import_attach) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	ret = drm_gem_create_mmap_offset(obj);
 	if (ret)
 		goto out;