From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiner Kallweit Subject: [PATCH net] r8169: fix setting driver_data after register_netdev Date: Mon, 26 Mar 2018 00:32:42 +0200 Message-ID: <4fbb6b47-d4aa-2b21-34ba-383e085ed236@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: "netdev@vger.kernel.org" To: Realtek linux nic maintainers , David Miller Return-path: Received: from mail-wm0-f67.google.com ([74.125.82.67]:50300 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750959AbeCYWjP (ORCPT ); Sun, 25 Mar 2018 18:39:15 -0400 Received: by mail-wm0-f67.google.com with SMTP id i75so12062548wmf.0 for ; Sun, 25 Mar 2018 15:39:15 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: 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 Signed-off-by: Heiner Kallweit --- 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 630409e0..604ae783 100644 --- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -8378,12 +8378,12 @@ 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, tp->mmio_addr, dev->dev_addr, (u32)(RTL_R32(tp, TxConfig) & 0x9cf0f8ff), -- 2.16.2