| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 186/190] r8169: fix setting driver_data after register_netdev | Date | Wed, 11 Apr 2018 20:37:12 +0200 |
| |
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Heiner Kallweit <hkallweit1@gmail.com>
[ Upstream commit 19c9ea363a244f85f90a424f9936e6d56449e33c ]
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@davemloft.net> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/ethernet/realtek/r8169.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -8411,12 +8411,12 @@ static int rtl_init_one(struct pci_dev * goto err_out_msi_4; } + pci_set_drvdata(pdev, dev); + rc = register_netdev(dev); if (rc < 0) goto err_out_cnt_5; - 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);
|