From a02044a3b9a44e24699311ed753491ebca472c62 Mon Sep 17 00:00:00 2001
From: Sander Vrijders <sander.vrijders@ugent.be>
Date: Fri, 24 Mar 2017 10:59:15 +0100
Subject: ipcpd: normal: Fix segfault in dijkstra calculation

This fixes a dumb segfault in the dijkstra calculation. If an entry
can be removed from the table it was set to NULL. However, if the
table is completely empty, the index was -1, resulting in an illegal
access into the table.
---
 src/ipcpd/normal/graph.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ipcpd/normal/graph.c b/src/ipcpd/normal/graph.c
index 2ae36918..ed545b8c 100644
--- a/src/ipcpd/normal/graph.c
+++ b/src/ipcpd/normal/graph.c
@@ -340,7 +340,8 @@ static int get_min_vertex(struct vertex ** vertices,
                 }
         }
 
-        vertices[index] = NULL;
+        if (index != -1)
+                vertices[index] = NULL;
 
         return index;
 }
-- 
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