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-rw-r--r--blockdev-nbd.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index e362572279..d1721a3e26 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -82,6 +82,11 @@ void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
NBDExport *exp;
NBDCloseNotifier *n;
+ if (server_fd == -1) {
+ error_setg(errp, "NBD server not running");
+ return;
+ }
+
if (nbd_export_find(device)) {
error_setg(errp, "NBD server already exporting device '%s'", device);
return;