linux-cve-announce - CVE-2022-49427: iommu/mediatek: Remove clk_disable in mtk_iommu

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Message-ID: <2025022655-CVE-2022-49427-f29d@gregkh>
Date: Wed, 26 Feb 2025 03:11:41 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49427: iommu/mediatek: Remove clk_disable in mtk_iommu_remove

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

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

iommu/mediatek: Remove clk_disable in mtk_iommu_remove

After the commit b34ea31fe013 ("iommu/mediatek: Always enable the clk on
resume"), the iommu clock is controlled by the runtime callback.
thus remove the clk control in the mtk_iommu_remove.

Otherwise, it will warning like:

echo 14018000.iommu > /sys/bus/platform/drivers/mtk-iommu/unbind

[   51.413044] ------------[ cut here ]------------
[   51.413648] vpp0_smi_iommu already disabled
[   51.414233] WARNING: CPU: 2 PID: 157 at */v5.15-rc1/kernel/mediatek/
                          drivers/clk/clk.c:952 clk_core_disable+0xb0/0xb8
[   51.417174] Hardware name: MT8195V/C(ENG) (DT)
[   51.418635] pc : clk_core_disable+0xb0/0xb8
[   51.419177] lr : clk_core_disable+0xb0/0xb8
...
[   51.429375] Call trace:
[   51.429694]  clk_core_disable+0xb0/0xb8
[   51.430193]  clk_core_disable_lock+0x24/0x40
[   51.430745]  clk_disable+0x20/0x30
[   51.431189]  mtk_iommu_remove+0x58/0x118
[   51.431705]  platform_remove+0x28/0x60
[   51.432197]  device_release_driver_internal+0x110/0x1f0
[   51.432873]  device_driver_detach+0x18/0x28
[   51.433418]  unbind_store+0xd4/0x108
[   51.433886]  drv_attr_store+0x24/0x38
[   51.434363]  sysfs_kf_write+0x40/0x58
[   51.434843]  kernfs_fop_write_iter+0x164/0x1e0

The Linux kernel CVE team has assigned CVE-2022-49427 to this issue.


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

	Issue introduced in 5.13 with commit b34ea31fe013569d42b7e8681ef3f717f77c5b72 and fixed in 5.15.46 with commit 053465ab20dcd324a43a1811ee98e5721e6a3e65
	Issue introduced in 5.13 with commit b34ea31fe013569d42b7e8681ef3f717f77c5b72 and fixed in 5.17.14 with commit 9b3bd97acb4f8954b8a43a5d63ed9050d463b4e1
	Issue introduced in 5.13 with commit b34ea31fe013569d42b7e8681ef3f717f77c5b72 and fixed in 5.18.3 with commit 6eaa046c696c83542c56765cdde564d9818ff1fb
	Issue introduced in 5.13 with commit b34ea31fe013569d42b7e8681ef3f717f77c5b72 and fixed in 5.19 with commit 98df772bdd1c4ce717a26289efea15cbbe4b64ed
	Issue introduced in 5.12.4 with commit 5cad9e2caa9613fdcd246bd4ebf0ffbec1cba2ca

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-2022-49427
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/mtk_iommu.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/053465ab20dcd324a43a1811ee98e5721e6a3e65
	https://git.kernel.org/stable/c/9b3bd97acb4f8954b8a43a5d63ed9050d463b4e1
	https://git.kernel.org/stable/c/6eaa046c696c83542c56765cdde564d9818ff1fb
	https://git.kernel.org/stable/c/98df772bdd1c4ce717a26289efea15cbbe4b64ed