From e87e3df67487676e9545c983c03c13fd644c5cf5 Mon Sep 17 00:00:00 2001
From: Ziye Yang <ziye.yang@intel.com>
Date: Tue, 14 Jun 2016 15:19:38 +0800
Subject: [PATCH] event: fix null pointer issue in spdk_subsystem_fini

The variable cur could be null, so if we use do while
will cause a segment fault

Change-Id: I19ec26e88948a0c3fd957e03e717b68750f40c62
Signed-off-by: Ziye Yang <ziye.yang@intel.com>
---
 lib/event/subsystem.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/event/subsystem.c b/lib/event/subsystem.c
index eb319914a..7edd92ba1 100644
--- a/lib/event/subsystem.c
+++ b/lib/event/subsystem.c
@@ -149,14 +149,16 @@ spdk_subsystem_fini(void)
 	struct spdk_subsystem *cur;
 
 	cur = TAILQ_LAST(&g_subsystems, spdk_subsystem_list);
-	do {
+
+	while (cur) {
 		if (cur->fini) {
 			rc = cur->fini();
 			if (rc)
 				return rc;
 		}
 		cur = TAILQ_PREV(cur, spdk_subsystem_list, tailq);
-	} while (cur);
+	}
+
 	return rc;
 }