From 8271bd16ce9327834d8580e55bb5e4e0896fd98a Mon Sep 17 00:00:00 2001
From: Thomas Hindoe Paaboel Andersen <phomes@gmail.com>
Date: Wed, 18 Jun 2014 23:35:01 +0200
Subject: [PATCH] bootchart: add assert

since 376cd3b89c62f580a6f576cecfbbb28d3944118f LIST_FIND_TAIL accepts
an empty list. That removed an assert in LIST_FIND_TAIL and we now
theoretically risk a null pointer deref. This adds the assert directly
to protect against that.
---
 src/bootchart/svg.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/bootchart/svg.c b/src/bootchart/svg.c
index 8121199..bf6636c 100644
--- a/src/bootchart/svg.c
+++ b/src/bootchart/svg.c
@@ -80,6 +80,8 @@ static void svg_header(void) {
         double h;
         struct list_sample_data *sampledata_last;
 
+        assert(head);
+
         sampledata = head;
         LIST_FIND_TAIL(link, sampledata, head);
         sampledata_last = head;
-- 
2.7.4