linux-kernel - [PATCH 4.2 19/61] net: thunder: Check for driver data in nicvf

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Date:	Sat, 12 Dec 2015 12:05:47 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Pavel Fedin <p.fedin@...sung.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.2 19/61] net: thunder: Check for driver data in nicvf_remove()

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pavel Fedin <p.fedin@...sung.com>

[ Upstream commit 7750130d93decff06120df0d8ea024ff8a038a21 ]

In some cases the crash is caused by nicvf_remove() being called from
outside. For example, if we try to feed the device to vfio after the
probe has failed for some reason. So, move the check to better place.

Signed-off-by: Pavel Fedin <p.fedin@...sung.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/cavium/thunder/nicvf_main.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -1325,7 +1325,12 @@ err_disable_device:
 static void nicvf_remove(struct pci_dev *pdev)
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
-	struct nicvf *nic = netdev_priv(netdev);
+	struct nicvf *nic;
+
+	if (!netdev)
+		return;
+
+	nic = netdev_priv(netdev);
 
 	unregister_netdev(netdev);
 	nicvf_unregister_interrupts(nic);


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