linux-kernel - [PATCH] xen-netback: correctly check failed allocation

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Message-Id: <1444932148-15633-1-git-send-email-wuninsu@gmail.com>
Date:	Thu, 15 Oct 2015 18:02:28 +0000
From:	Insu Yun <wuninsu@...il.com>
To:	ian.campbell@...rix.com, wei.liu2@...rix.com,
	xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	taesoo@...ech.edu, yeongjin.jang@...ech.edu, insu@...ech.edu,
	Insu Yun <wuninsu@...il.com>
Subject: [PATCH] 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@...il.com>
---
 drivers/net/xen-netback/xenbus.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 929a6e7..56ebd82 100644
--- 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;
 
-- 
1.9.1

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