block: Prepare for NULL BDS

[thirdparty/qemu.git] / monitor.c

diff --git a/monitor.c b/monitor.c
index 4f1ba2f6669726fd93e881b9febc40bc6065a03d..301a143ffaaa7a56d79e26f2cbdd6780347d9dc2 100644 (file)
--- a/monitor.c
+++ b/monitor.c
@@ -4145,6 +4145,10 @@ int monitor_read_block_device_key(Monitor *mon, const char *device,
         monitor_printf(mon, "Device not found %s\n", device);
         return -1;
     }
+    if (!blk_bs(blk)) {
+        monitor_printf(mon, "Device '%s' has no medium\n", device);
+        return -1;
+    }
 
     bdrv_add_key(blk_bs(blk), NULL, &err);
     if (err) {