From: Eric Blake <eblake@redhat.com>
Date: Thu, 13 Oct 2011 00:10:24 +0000 (-0600)
Subject: qemu: check for json allocation failure
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=ce521f242aad8c9bddbe04802c309150f4508b58;p=libvirt.git

qemu: check for json allocation failure

Detected by Coverity.  Introduced in commit b1b5b51.

* src/qemu/qemu_monitor_json.c (qemuMonitorJSONGetBlockInfo):
Avoid null dereference.
---

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);