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-rw-r--r--lib/rbtree.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/rbtree.c b/lib/rbtree.c
index 1e55ba1c2ed..48499c2d88c 100644
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -322,6 +322,9 @@ struct rb_node *rb_next(struct rb_node *node)
{
struct rb_node *parent;
+ if (rb_parent(node) == node)
+ return NULL;
+
/* If we have a right-hand child, go down and then left as far
as we can. */
if (node->rb_right) {
@@ -348,6 +351,9 @@ struct rb_node *rb_prev(struct rb_node *node)
{
struct rb_node *parent;
+ if (rb_parent(node) == node)
+ return NULL;
+
/* If we have a left-hand child, go down and then right as far
as we can. */
if (node->rb_left) {