linux-cve-announce - CVE-2024-56561: PCI: endpoint: Fix PCI domain ID release in pci_epc

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Message-ID: <2024122713-CVE-2024-56561-a041@gregkh>
Date: Fri, 27 Dec 2024 15:23:12 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56561: PCI: endpoint: Fix PCI domain ID release in pci_epc_destroy()

Description
===========

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]

The Linux kernel CVE team has assigned CVE-2024-56561 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.12 with commit 0328947c50324cf4b2d8b181bf948edb8101f59f and fixed in 6.12.4 with commit c74a1df6c2a2df7dd45c3fc1a5edc29a075dcf22
	Issue introduced in 6.12 with commit 0328947c50324cf4b2d8b181bf948edb8101f59f and fixed in 6.13-rc1 with commit 4acc902ed3743edd4ac2d3846604a99d17104359
	Issue introduced in 6.11.4 with commit a4934cd7a18d35fc57025f23773f6f19e2b2dbb1

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-56561
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/pci/endpoint/pci-epc-core.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/c74a1df6c2a2df7dd45c3fc1a5edc29a075dcf22
	https://git.kernel.org/stable/c/4acc902ed3743edd4ac2d3846604a99d17104359