lib: Add nullcheck before graph node deletion

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/graph.c b/lib/graph.c
index 314cf86850..18f32b8ca2 100644
--- a/lib/graph.c
+++ b/lib/graph.c
@@ -62,6 +62,7 @@ graph_delete_node (struct graph *graph, struct graph_node *node)
   for (unsigned int i = 0; i < vector_active (node->from); i++)
     {
       adj = vector_slot (node->from, i);
+      if (!adj) continue;
       for (unsigned int j = 0; j < vector_active (adj->to); j++)
         if (vector_slot (adj->to, j) == node)
           vector_unset (adj->to, j);
@@ -71,6 +72,7 @@ graph_delete_node (struct graph *graph, struct graph_node *node)
   for (unsigned int i = 0; i < vector_active (node->to); i++)
     {
       adj = vector_slot (node->to, i);
+      if (!adj) continue;
       for (unsigned int j = 0; j < vector_active (adj->from); j++)
         if (vector_slot (adj->from, j) == node)
           vector_unset (adj->from, j);