linux-kernel - Re: [PATCH rc] iommu/arm-smmu-v3: Revert vmaster in the error path

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Message-ID: <aHDK3PIpwWvkwJtB@google.com>
Date: Fri, 11 Jul 2025 08:27:08 +0000
From: Pranjal Shrivastava <praan@...gle.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: will@...nel.org, joro@...tes.org, jgg@...dia.com, kevin.tian@...el.com,
	baolu.lu@...ux.intel.com, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH rc] iommu/arm-smmu-v3: Revert vmaster in the error path

On Thu, Jul 10, 2025 at 04:30:03PM -0700, Nicolin Chen wrote:
> The error path in the arm_smmu_attach_prepare() was introduced with the
> arm_smmu_enable_iopf(). Due to a rebase issue, it forgot to include the
> revert of the vmaster.
> 
> Move kfree(state->vmaster) to the error path, to prevent memory leak.
> 
> Fixes: cfea71aea921 ("iommu/arm-smmu-v3: Put iopf enablement in the domain attach path")
> Cc: stable@...r.kernel.org
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

Reviewed-by: Pranjal Shrivastava <praan@...gle.com>

Thanks!
Praan

> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 181d07bc1a9d..3c79cdbbd9e7 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2906,8 +2906,8 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
>  
>  		master_domain = kzalloc(sizeof(*master_domain), GFP_KERNEL);
>  		if (!master_domain) {
> -			kfree(state->vmaster);
> -			return -ENOMEM;
> +			ret = -ENOMEM;
> +			goto err_free_vmaster;
>  		}
>  		master_domain->domain = new_domain;
>  		master_domain->master = master;
> @@ -2941,7 +2941,6 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
>  		    !arm_smmu_master_canwbs(master)) {
>  			spin_unlock_irqrestore(&smmu_domain->devices_lock,
>  					       flags);
> -			kfree(state->vmaster);
>  			ret = -EINVAL;
>  			goto err_iopf;
>  		}
> @@ -2967,6 +2966,8 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
>  	arm_smmu_disable_iopf(master, master_domain);
>  err_free_master_domain:
>  	kfree(master_domain);
> +err_free_vmaster:
> +	kfree(state->vmaster);
>  	return ret;
>  }
>  
> -- 
> 2.43.0
> 
>