diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 03dc5f68ffad..c7154a7f696a 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1258,6 +1258,16 @@ int v4l2_subdev_link_validate(struct media_link *link)
 	bool states_locked;
 	int ret;
 
+	if (!is_media_entity_v4l2_subdev(link->sink->entity) ||
+	    !is_media_entity_v4l2_subdev(link->source->entity)) {
+		pr_warn_once("%s of link '%s':%u->'%s':%u is not a V4L2 sub-device, driver bug!\n",
+			     !is_media_entity_v4l2_subdev(link->sink->entity) ?
+			     "sink" : "source",
+			     link->source->entity->name, link->source->index,
+			     link->sink->entity->name, link->sink->index);
+		return 0;
+	}
+
 	sink_sd = media_entity_to_v4l2_subdev(link->sink->entity);
 	source_sd = media_entity_to_v4l2_subdev(link->source->entity);