From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Tue, 24 Dec 2013 11:58:01 +0000 (+0100)
Subject: drm/omap: Don't dereference list head when the connectors list is empty
X-Git-Tag: v3.15-rc1~51^2~15^2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=06fb220b2d1a80be5621fa06ef276a3890e6be78;p=linux.git

drm/omap: Don't dereference list head when the connectors list is empty

The connectors list iterator returns the list head when the list is
empty. Fix it by returning NULL in that case.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Rob Clark <robdclark@gmail.com>
---

diff --git a/drivers/gpu/drm/omapdrm/omap_fb.c b/drivers/gpu/drm/omapdrm/omap_fb.c
index f466c4aaee94..19a9b8613620 100644
--- a/drivers/gpu/drm/omapdrm/omap_fb.c
+++ b/drivers/gpu/drm/omapdrm/omap_fb.c
@@ -306,7 +306,8 @@ struct drm_connector *omap_framebuffer_get_next_connector(
 	struct drm_connector *connector = from;
 
 	if (!from)
-		return list_first_entry(connector_list, typeof(*from), head);
+		return list_first_entry_or_null(connector_list, typeof(*from),
+						head);
 
 	list_for_each_entry_from(connector, connector_list, head) {
 		if (connector != from) {