linux-kernel - Re: [PATCH v2] iommu/amd: Fix possible memory leak of 'domain'

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Date:   Thu, 8 Jun 2023 09:47:43 +0530
From:   Vasant Hegde <vasant.hegde@....com>
To:     Su Hui <suhui@...china.com>, Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     kevin.tian@...el.com, jgg@...pe.ca, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iommu/amd: Fix possible memory leak of 'domain'

On 6/8/2023 7:49 AM, Su Hui wrote:
> Move allocation code down to avoid memory leak.
> 
> Fixes: 29f54745f245 ("iommu/amd: Add missing domain type checks")
> Signed-off-by: Su Hui <suhui@...china.com>

Reviewed-by: Vasant Hegde <vasant.hegde@....com>


-Vasant


> ---
> Changes in v2:
> 	change code order is better and more consistent with other
> drivers. 
>  drivers/iommu/amd/iommu.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index dc1ec6849775..e8a2e5984acb 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -2078,10 +2078,6 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
>  	int mode = DEFAULT_PGTABLE_LEVEL;
>  	int ret;
>  
> -	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
> -	if (!domain)
> -		return NULL;
> -
>  	/*
>  	 * Force IOMMU v1 page table when iommu=pt and
>  	 * when allocating domain for pass-through devices.
> @@ -2097,6 +2093,10 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
>  		return NULL;
>  	}
>  
> +	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
> +	if (!domain)
> +		return NULL;
> +
>  	switch (pgtable) {
>  	case AMD_IOMMU_V1:
>  		ret = protection_domain_init_v1(domain, mode);