[PATCH] qemu: check for json allocation failure

[Eric Blake <eblake@xxxxxxxxxx>]

Detected by Coverity.  Introduced in commit b1b5b51.

* src/qemu/qemu_monitor_json.c (qemuMonitorJSONGetBlockInfo):
Avoid null dereference on OOM.
---
 src/qemu/qemu_monitor_json.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 18d1c9f..cd8f1e5 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);
-- 
1.7.4.4

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