From 4782183da39ec988b8290bbc0289c9f50ba33ea4 Mon Sep 17 00:00:00 2001
From: Chunyan Liu <cyliu@suse.com>
Date: Thu, 5 Jun 2014 17:20:50 +0800
Subject: [PATCH] QemuOpts: check NULL input for qemu_opts_del

To simplify later using of qemu_opts_del, accept NULL input.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Leandro Dorileo <l@dorileo.org>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 util/qemu-option.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/util/qemu-option.c b/util/qemu-option.c
index 6acfb0eb41..40e1ff384a 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -1011,6 +1011,10 @@ void qemu_opts_del(QemuOpts *opts)
 {
     QemuOpt *opt;
 
+    if (opts == NULL) {
+        return;
+    }
+
     for (;;) {
         opt = QTAILQ_FIRST(&opts->head);
         if (opt == NULL)