[Xen-devel] [PATCH] xen-netback: correctly check failed allocation

[Insu Yun <wuninsu@xxxxxxxxx>]

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

Signed-off-by: Insu Yun <wuninsu@xxxxxxxxx>
---
 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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