linux-cve-announce - CVE-2022-49323: iommu/arm-smmu: fix possible null-ptr-deref in arm_smmu_device

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Message-ID: <2025022638-CVE-2022-49323-7559@gregkh>
Date: Wed, 26 Feb 2025 03:09:57 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49323: iommu/arm-smmu: fix possible null-ptr-deref in arm_smmu_device_probe()

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

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

iommu/arm-smmu: fix possible null-ptr-deref in arm_smmu_device_probe()

It will cause null-ptr-deref when using 'res', if platform_get_resource()
returns NULL, so move using 'res' after devm_ioremap_resource() that
will check it to avoid null-ptr-deref.
And use devm_platform_get_and_ioremap_resource() to simplify code.

The Linux kernel CVE team has assigned CVE-2022-49323 to this issue.


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

	Fixed in 5.10.122 with commit 3660db29b0305f9a1d95979c7af0f5db6ea99f5d
	Fixed in 5.15.47 with commit 98dd53a92825747395649f54d23512a13c3ed471
	Fixed in 5.17.15 with commit 80776a71340f57d6a4952635fc89f0342072f3ca
	Fixed in 5.18.4 with commit 449fc4561762ad9ad85362d5f01f0d0df397457a
	Fixed in 5.19 with commit d9ed8af1dee37f181096631fb03729ece98ba816

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-2022-49323
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/iommu/arm/arm-smmu/arm-smmu.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/3660db29b0305f9a1d95979c7af0f5db6ea99f5d
	https://git.kernel.org/stable/c/98dd53a92825747395649f54d23512a13c3ed471
	https://git.kernel.org/stable/c/80776a71340f57d6a4952635fc89f0342072f3ca
	https://git.kernel.org/stable/c/449fc4561762ad9ad85362d5f01f0d0df397457a
	https://git.kernel.org/stable/c/d9ed8af1dee37f181096631fb03729ece98ba816