From ce521f242aad8c9bddbe04802c309150f4508b58 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Wed, 12 Oct 2011 18:10:24 -0600
Subject: [PATCH] qemu: check for json allocation failure

Detected by Coverity.  Introduced in commit b1b5b51.

* src/qemu/qemu_monitor_json.c (qemuMonitorJSONGetBlockInfo):
Avoid null dereference.
---
 src/qemu/qemu_monitor_json.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 18d1c9f51d..cd8f1e599c 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -1364,6 +1364,9 @@ int qemuMonitorJSONGetBlockInfo(qemuMonitorPtr mon,
     virJSONValuePtr reply = NULL;
     virJSONValuePtr devices;
 
+    if (!cmd)
+        return -1;
+
     ret = qemuMonitorJSONCommand(mon, cmd, &reply);
     if (ret == 0)
         ret = qemuMonitorJSONCheckError(cmd, reply);
-- 
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