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Message-ID: <2024122834-CVE-2024-56689-69ca@gregkh>
Date: Sat, 28 Dec 2024 10:45:41 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56689: PCI: endpoint: epf-mhi: Avoid NULL dereference if DT lacks 'mmio'

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

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

PCI: endpoint: epf-mhi: Avoid NULL dereference if DT lacks 'mmio'

If platform_get_resource_byname() fails and returns NULL because DT lacks
an 'mmio' property for the MHI endpoint, dereferencing res->start will
cause a NULL pointer access. Add a check to prevent it.

[kwilczynski: error message update per the review feedback]
[bhelgaas: commit log]

The Linux kernel CVE team has assigned CVE-2024-56689 to this issue.


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

	Issue introduced in 6.5 with commit 1bf5f25324f7f6a52c3eb566ec5f78f6a901db96 and fixed in 6.6.64 with commit 242ee2b0ad9b23f47084904fce3f9f228068a1f9
	Issue introduced in 6.5 with commit 1bf5f25324f7f6a52c3eb566ec5f78f6a901db96 and fixed in 6.11.11 with commit c8b9d6b7d62a444e0bca5b9ae28f9f2b0f52feef
	Issue introduced in 6.5 with commit 1bf5f25324f7f6a52c3eb566ec5f78f6a901db96 and fixed in 6.12.2 with commit 0e6d92e3b973de78eb7015154cf1197af9fac5c9
	Issue introduced in 6.5 with commit 1bf5f25324f7f6a52c3eb566ec5f78f6a901db96 and fixed in 6.13-rc1 with commit 5089b3d874e9933d9842e90410d3af1520494757

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-2024-56689
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/functions/pci-epf-mhi.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/242ee2b0ad9b23f47084904fce3f9f228068a1f9
	https://git.kernel.org/stable/c/c8b9d6b7d62a444e0bca5b9ae28f9f2b0f52feef
	https://git.kernel.org/stable/c/0e6d92e3b973de78eb7015154cf1197af9fac5c9
	https://git.kernel.org/stable/c/5089b3d874e9933d9842e90410d3af1520494757

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