linux-kernel - Re: [PATCH rc 2/2] iommu/tegra241-cmdqv: Fix UAF due to re-entry of tegra241_cmdqv

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Message-ID: <20250407174550.GC1722458@nvidia.com>
Date: Mon, 7 Apr 2025 14:45:50 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: will@...nel.org, thierry.reding@...il.com, vdumpa@...dia.com,
	robin.murphy@....com, joro@...tes.org, jonathanh@...dia.com,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH rc 2/2] iommu/tegra241-cmdqv: Fix UAF due to re-entry of
 tegra241_cmdqv_remove()

On Mon, Apr 07, 2025 at 01:35:00AM -0700, Nicolin Chen wrote:
> When falling back to standard SMMU CMDQ, impl_ops must be set to NULL, so
> tegra241_cmdqv_remove() will not be re-entered by arm_smmu_impl_remove(),
> which will trigger a UAF.
> 
> Fixes: 483e0bd8883a ("iommu/tegra241-cmdqv: Do not allocate vcmdq until dma_set_mask_and_coherent")
> Cc: stable@...r.kernel.org
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 1 +
>  1 file changed, 1 insertion(+)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason