From: Pavel Skripkin paskripkin@gmail.com
stable inclusion from stable-v4.19.196 commit 0260916843cc74f3906acf8b6f256693e01530a2 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9R4HZ CVE: CVE-2021-47235
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 9cca0c2d70149160407bda9a9446ce0c29b6e6c6 ]
static void ec_bhf_remove(struct pci_dev *dev) { ... struct ec_bhf_priv *priv = netdev_priv(net_dev);
unregister_netdev(net_dev); free_netdev(net_dev);
pci_iounmap(dev, priv->dma_io); pci_iounmap(dev, priv->io); ... }
priv is netdev private data, but it is used after free_netdev(). It can cause use-after-free when accessing priv pointer. So, fix it by moving free_netdev() after pci_iounmap() calls.
Fixes: 6af55ff52b02 ("Driver for Beckhoff CX5020 EtherCAT master module.") Signed-off-by: Pavel Skripkin paskripkin@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Kaixiong Yu yukaixiong@huawei.com --- drivers/net/ethernet/ec_bhf.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/ec_bhf.c b/drivers/net/ethernet/ec_bhf.c index d71cba0842c5..59dc20020c73 100644 --- a/drivers/net/ethernet/ec_bhf.c +++ b/drivers/net/ethernet/ec_bhf.c @@ -585,10 +585,12 @@ static void ec_bhf_remove(struct pci_dev *dev) struct ec_bhf_priv *priv = netdev_priv(net_dev);
unregister_netdev(net_dev); - free_netdev(net_dev);
pci_iounmap(dev, priv->dma_io); pci_iounmap(dev, priv->io); + + free_netdev(net_dev); + pci_release_regions(dev); pci_clear_master(dev); pci_disable_device(dev);