Re: [PATCH] iommu/arm-smmu-qcom: Fix mask extraction for bootloader programmed SMRs
From: Will Deacon <will@kernel.org>
Date: 2021-01-27 13:26:42
Also in:
linux-iommu, lkml, stable
On Mon, 25 Jan 2021 13:52:25 -0800, Isaac J. Manjarres wrote:
When extracting the mask for a SMR that was programmed by the
bootloader, the SMR's valid bit is also extracted and is treated
as part of the mask, which is not correct. Consider the scenario
where an SMMU master whose context is determined by a bootloader
programmed SMR is removed (omitting parts of device/driver core):
->iommu_release_device()
-> arm_smmu_release_device()
-> arm_smmu_master_free_smes()
-> arm_smmu_free_sme() /* Assume that the SME is now free */
-> arm_smmu_write_sme()
-> arm_smmu_write_smr() /* Construct SMR value using mask and SID */
[...]
Applied to will (for-joerg/arm-smmu/updates), thanks!
[1/1] iommu/arm-smmu-qcom: Fix mask extraction for bootloader programmed SMRs
https://git.kernel.org/will/c/dead723e6f04
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
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