linux-kernel - [PATCH 5/9] staging: hv: re-order the code in netvsc

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Date:	Thu, 21 Jul 2011 10:14:53 -0700
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	haiyangz@...rosoft.com, hjanssen@...rosoft.com, kys@...rosoft.com,
	v-abkane@...rosoft.com, gregkh@...e.de,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	virtualization@...ts.osdl.org
Subject: [PATCH 5/9] staging: hv: re-order the code in netvsc_probe()

Re-order the code in netvsc_probe() to prevent a guest crash caused by
packets possibly received from NetVSP before call to register_netdev().

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/staging/hv/netvsc_drv.c |   32 +++++++++++++++++---------------
 1 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/hv/netvsc_drv.c b/drivers/staging/hv/netvsc_drv.c
index c8e2f24..816e382 100644
--- a/drivers/staging/hv/netvsc_drv.c
+++ b/drivers/staging/hv/netvsc_drv.c
@@ -350,19 +350,6 @@ static int netvsc_probe(struct hv_device *dev)
 	dev_set_drvdata(&dev->device, net);
 	INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);
 
-	/* Notify the netvsc driver of the new device */
-	device_info.ring_size = ring_size;
-	ret = rndis_filter_device_add(dev, &device_info);
-	if (ret != 0) {
-		free_netdev(net);
-		dev_set_drvdata(&dev->device, NULL);
-		return ret;
-	}
-
-	netif_carrier_on(net);
-
-	memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
-
 	net->netdev_ops = &device_ops;
 
 	/* TODO: Add GSO and Checksum offload */
@@ -374,11 +361,26 @@ static int netvsc_probe(struct hv_device *dev)
 
 	ret = register_netdev(net);
 	if (ret != 0) {
-		/* Remove the device and release the resource */
-		rndis_filter_device_remove(dev);
+		pr_err("Unable to register netdev.\n");
 		free_netdev(net);
+		goto out;
 	}
 
+	/* Notify the netvsc driver of the new device */
+	device_info.ring_size = ring_size;
+	ret = rndis_filter_device_add(dev, &device_info);
+	if (ret != 0) {
+		netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
+		unregister_netdev(net);
+		free_netdev(net);
+		dev_set_drvdata(&dev->device, NULL);
+		return ret;
+	}
+	memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
+
+	netif_carrier_on(net);
+
+out:
 	return ret;
 }
 
-- 
1.6.3.2

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