CVE-2022-49427

Summary

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

Affected Software

Weaknesses

References

• 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

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