netdev - [PATCH v2 net] r8169: fix setting driver_data after register

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Message-ID: <2e728314-2f34-1e51-7a4a-ae227eb2a2c6@gmail.com>
Date:   Mon, 26 Mar 2018 19:19:30 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH v2 net] r8169: fix setting driver_data after register_netdev

pci_set_drvdata() is called only after registering the net_device,
therefore we could run into a NPE if one of the functions using
driver_data is called before it's set.

Fix this by calling pci_set_drvdata() before registering the
net_device.

This fix is a candidate for stable. As far as I can see the
bug has been there in kernel version 3.2 already, therefore
I can't provide a reference which commit is fixed by it.

The fix may need small adjustments per kernel version because
due to other changes the label which is jumped to if
register_netdev() fails has changed over time.

Reported-by: David Miller <davem@...emloft.net>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
v2:
- rebased based on net instead of net-next
---
 drivers/net/ethernet/realtek/r8169.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 0bf7d1759..b4779acb6 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -8660,12 +8660,12 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (!tp->counters)
 		return -ENOMEM;

+	pci_set_drvdata(pdev, dev);
+
 	rc = register_netdev(dev);
 	if (rc < 0)
 		return rc;

-	pci_set_drvdata(pdev, dev);
-
 	netif_info(tp, probe, dev, "%s at 0x%p, %pM, XID %08x IRQ %d\n",
 		   rtl_chip_infos[chipset].name, ioaddr, dev->dev_addr,
 		   (u32)(RTL_R32(TxConfig) & 0x9cf0f8ff), pdev->irq);
-- 
2.16.2