From c5ca209f5848c68334c06cb2955758bd486fd149 Mon Sep 17 00:00:00 2001
From: Wang King <king.wang@huawei.com>
Date: Wed, 12 Apr 2017 16:22:57 +0800
Subject: [PATCH] util: systemd: Don't strlen a possibly NULL string

Coverity complains about virBufferCurrentContent might be return null
when calling strlen, so check virBufferError first before calling
strlen.
---
 src/util/virsystemd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/util/virsystemd.c b/src/util/virsystemd.c
index ceb1c1a958..83737a2c6f 100644
--- a/src/util/virsystemd.c
+++ b/src/util/virsystemd.c
@@ -135,6 +135,8 @@ virSystemdAppendValidMachineName(virBufferPtr buf,
     bool skip_dot = false;
 
     for (; *name; name++) {
+        if (virBufferError(buf))
+            break;
         if (strlen(virBufferCurrentContent(buf)) >= 64)
             break;