CVE-2022-49427

/// Technical 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+

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References