xen-netback: correctly check failed allocation

insuyun · davem330 · commit 833b8f18adfc · 2015-10-18T19:37:29.000-07:00
Since vzalloc can be failed in memory pressure,
writes -ENOMEM to xenstore to indicate error.

Signed-off-by: Insu Yun &lt;wuninsu@gmail.com&gt;
Acked-by: Wei Liu &lt;wei.liu2@citrix.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
@@ -788,6 +788,12 @@ static void connect(struct backend_info *be)
 	/* Use the number of queues requested by the frontend */
 	be->vif->queues = vzalloc(requested_num_queues *
 				  sizeof(struct xenvif_queue));
+	if (!be->vif->queues) {
+		xenbus_dev_fatal(dev, -ENOMEM,
+				 "allocating queues");
+		return;
+	}
+
 	be->vif->num_queues = requested_num_queues;
 	be->vif->stalled_queues = requested_num_queues;
 
