[PATCH rc 2/2] iommu/tegra241-cmdqv: Fix UAF due to re-entry of tegra241_cmdqv_remove()

[Jason Gunthorpe]

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 at vger.kernel.org
> Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>
> ---
>  drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 1 +
>  1 file changed, 1 insertion(+)

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>

Jason