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Message-Id: <20210329075611.770657491@linuxfoundation.org>
Date: Mon, 29 Mar 2021 09:58:21 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Tong Zhang <ztong0001@...il.com>,
Marc Kleine-Budde <mkl@...gutronix.de>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 45/72] can: c_can_pci: c_can_pci_remove(): fix use-after-free
From: Tong Zhang <ztong0001@...il.com>
[ Upstream commit 0429d6d89f97ebff4f17f13f5b5069c66bde8138 ]
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: 5b92da0443c2 ("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@...il.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/net/can/c_can/c_can_pci.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index 406b4847e5dc..7efb60b50876 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -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);
--
2.30.1
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