From 5c16beff9909b28f55f25f48ed7ddbf98d8b1d5c Mon Sep 17 00:00:00 2001
From: Roy Li <rongqing.li@windriver.com>
Date: Wed, 18 Jul 2018 09:43:55 +0800
Subject: [PATCH] fix NULL pointer problem

return 0 if distance_table is NULL

Upstream-Status: Pending

read_distance_table() maybe return 0, but distance_table is not set,
if distance_table is used, and will lead to SEGFAULT

Signed-off-by: Roy Li <rongqing.li@windriver.com>

Signed-off-by: Changqing Li <changqing.li@windriver.com>
---
 distance.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/distance.c b/distance.c
index 8d472af..6a6e886 100644
--- a/distance.c
+++ b/distance.c
@@ -113,6 +113,8 @@ int numa_distance(int a, int b)
 		int err = read_distance_table();
 		if (err < 0)
 			return 0;
+		if(!distance_table)
+			return 0;
 	}
 	if ((unsigned)a >= distance_numnodes || (unsigned)b >= distance_numnodes)
 		return 0;
-- 
2.7.4