linux-cve-announce - CVE-2024-56782: ACPI: x86: Add adev NULL check to acpi_quirk_skip_serdev

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Message-ID: <2025010807-CVE-2024-56782-d049@gregkh>
Date: Wed,  8 Jan 2025 18:52:08 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56782: ACPI: x86: Add adev NULL check to acpi_quirk_skip_serdev_enumeration()

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

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

ACPI: x86: Add adev NULL check to acpi_quirk_skip_serdev_enumeration()

acpi_dev_hid_match() does not check for adev == NULL, dereferencing
it unconditional.

Add a check for adev being NULL before calling acpi_dev_hid_match().

At the moment acpi_quirk_skip_serdev_enumeration() is never called with
a controller_parent without an ACPI companion, but better safe than sorry.

The Linux kernel CVE team has assigned CVE-2024-56782 to this issue.


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

	Fixed in 6.12.5 with commit e173bce05f7032a8b4964cfef82a4b7668f5f3af
	Fixed in 6.13-rc1 with commit 4a49194f587a62d972b602e3e1a2c3cfe6567966

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-2024-56782
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/acpi/x86/utils.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/e173bce05f7032a8b4964cfef82a4b7668f5f3af
	https://git.kernel.org/stable/c/4a49194f587a62d972b602e3e1a2c3cfe6567966