From: Insu Yun <wuninsu@gmail.com>
Date: Thu, 15 Oct 2015 18:02:28 +0000 (+0000)
Subject: xen-netback: correctly check failed allocation
X-Git-Tag: v4.1.12-92~199^2^2
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=3c8ac452f90c0a2a50626366d4f9c8d9c295d5c8;p=users%2Fjedix%2Flinux-maple.git

xen-netback: correctly check failed allocation

Since vzalloc can be failed in memory pressure,
writes -ENOMEM to xenstore to indicate error.

Signed-off-by: Insu Yun <wuninsu@gmail.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 833b8f18adfcca04070a8a42d545a4553379d36f)
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
(cherry picked from commit afdd9c09c1689f43598a520ed60813dc6359d6c6)
---

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index bacf4e2942ec2..37139022eef65 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -784,6 +784,12 @@ 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;