linux-kernel - Re: [PATCH] iommu/amd: Stop irq_remapping_select() matching when remapping is disabled

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Date:   Tue,  5 Jan 2021 22:07:02 +0000
From:   Will Deacon <will@...nel.org>
To:     Johnathan Smithinovic <johnathan.smithinovic@....at>,
        mingo@...hat.com, David Woodhouse <dwmw2@...radead.org>,
        tglx@...utronix.de, bp@...en8.de
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        iommu <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH] iommu/amd: Stop irq_remapping_select() matching when remapping is disabled

On Tue, 05 Jan 2021 01:36:13 +0000, David Woodhouse wrote:
> The AMD IOMMU initialisation registers the IRQ remapping domain for
> each IOMMU before doing the final sanity check that every I/OAPIC is
> covered.
> 
> This means that the AMD irq_remapping_select() function gets invoked
> even when IRQ remapping has been disabled, eventually leading to a NULL
> pointer dereference in alloc_irq_table().
> 
> [...]

Applied to arm64 (for-next/iommu/fixes), thanks!

[1/1] iommu/amd: Stop irq_remapping_select() matching when remapping is disabled
      https://git.kernel.org/arm64/c/b34f10c2dc59

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev