linux-kernel - Re: [PATCH] iommu/amd: Fix possible memory leak of 'domain'

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Message-ID: <ZICSskXNlR+ckKvC@ziepe.ca>
Date:   Wed, 7 Jun 2023 11:22:42 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Su Hui <suhui@...china.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>, kevin.tian@...el.com,
        vasant.hegde@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/amd: Fix possible memory leak of 'domain'

On Tue, Jun 06, 2023 at 03:07:42PM +0800, Su Hui wrote:
> free memory of domain before return NULL.
> 
> Fixes: 29f54745f245 ("iommu/amd: Add missing domain type checks")
> Signed-off-by: Su Hui <suhui@...china.com>
> ---
>  drivers/iommu/amd/iommu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index dc1ec6849775..f08e65629c74 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -2094,7 +2094,7 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
>  	} else if (type == IOMMU_DOMAIN_DMA || type == IOMMU_DOMAIN_DMA_FQ) {
>  		pgtable = amd_iommu_pgtable;
>  	} else {
> -		return NULL;
> +		goto out_err;
>  	}

It might be nicer to order to allocation after the type checks, it is
more consistent with the other drivers

This is fine too

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

Thanks,
Jason