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can: c_can_pci: c_can_pci_remove(): fix use-after-free

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There is a UAF in c_can_pci_remove(). dev is released by
free_c_can_dev() and is used by pci_iounmap(pdev, priv->base) later.
To fix this issue, save the mmio address before releasing dev.

Fixes: 5b92da0443 ("c_can_pci: generic module for C_CAN/D_CAN on PCI")
Link: https://lore.kernel.org/r/20210301024512.539039-1-ztong0001@gmail.com
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Tong Zhang 2021-02-28 21:45:11 -05:00 committed by Marc Kleine-Budde
parent 7507479c46
commit 0429d6d89f
1 changed files with 2 additions and 1 deletions
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3
drivers/net/can/c_can/c_can_pci.c
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@ -239,12 +239,13 @@ static void c_can_pci_remove(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct c_can_priv *priv = netdev_priv(dev);
void __iomem *addr = priv->base;
unregister_c_can_dev(dev);
free_c_can_dev(dev);
pci_iounmap(pdev, priv->base);
pci_iounmap(pdev, addr);
pci_disable_msi(pdev);
pci_clear_master(pdev);
pci_release_regions(pdev);