CVE-2021-47235 Information

May 23, 2024 cve

Description

In the Linux kernel the following vulnerability has been resolved:

net: ethernet: fix potential use-after-free in ec_bhf_remove

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.

Reference

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