CVE-2024-56561

In the Linux kernel, the following vulnerability has been resolved:

PCI: endpoint: Fix PCI domain ID release in pci_epc_destroy()

pci_epc_destroy() invokes pci_bus_release_domain_nr() to release the PCI domain ID, but there are two issues:

• epc->dev is passed to pci_bus_release_domain_nr() which was already freed by device_unregister(), leading to a use-after-free issue.

• Domain ID corresponds to the EPC device parent, so passing epc->dev is also wrong.

Fix these issues by passing epc->dev.parent to pci_bus_release_domain_nr() and also do it before device_unregister().

[mani: reworded subject and description]

Affected Software

References

• https://git.kernel.org/stable/c/4acc902ed3743edd4ac2d3846604a99d17104359
• https://git.kernel.org/stable/c/c74a1df6c2a2df7dd45c3fc1a5edc29a075dcf22