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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Jeff Mahoney <jeffm@suse.com>,
        Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 070/293] ixgbe: pci_set_drvdata must be called
 before register_netdev
Thread-Topic: [PATCH AUTOSEL for 4.9 070/293] ixgbe: pci_set_drvdata must be
 called before register_netdev
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Date:   Mon, 9 Apr 2018 00:23:48 +0000
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From: Jeff Mahoney <jeffm@suse.com>

[ Upstream commit a09c0fc3f5d775231f1884e0e66c495065a461ee ]

We call pci_set_drvdata immediately after calling register_netdev,
which leaves a window where tasks writing to the sriov_numvfs sysfs
attribute can sneak in and crash the kernel.  register_netdev cleans
up after itself so placing pci_set_drvdata immediately before it
should preserve the intent of commit 0fb6a55cc31f ("ixgbe: fix crash
on rmmod after probe fail").

Fixes: 0fb6a55cc31f ("ixgbe: fix crash on rmmod after probe fail")
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/et=
hernet/intel/ixgbe/ixgbe_main.c
index 4856cf83f9e4..d2e3f8b73849 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -9758,11 +9758,11 @@ skip_sriov:
 			   "hardware.\n");
 	}
 	strcpy(netdev->name, "eth%d");
+	pci_set_drvdata(pdev, adapter);
 	err =3D register_netdev(netdev);
 	if (err)
 		goto err_register;
=20
-	pci_set_drvdata(pdev, adapter);
=20
 	/* power down the optics for 82599 SFP+ fiber */
 	if (hw->mac.ops.disable_tx_laser)
--=20
2.15.1