linux-kernel - Re: [PATCH] msm: iommu: fix leak and invalid access

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Message-ID: <519C5E8F.7060006@huawei.com>
Date:	Wed, 22 May 2013 13:58:39 +0800
From:	Libo Chen <clbchenlibo.chen@...wei.com>
To:	<ohad@...ery.com>, <joerg.roedel@....com>, <davidb@...eaurora.org>
CC:	LKML <linux-kernel@...r.kernel.org>, <joro@...tes.org>,
	<Varun.Sethi@...escale.com>, <iommu@...ts.linux-foundation.org>,
	<mingo@...nel.org>, <ddutile@...hat.com>
Subject: Re: [PATCH] msm: iommu: fix leak and invalid access


ping...

On 2013/5/15 12:47, Libo Chen wrote:
> 
> This patch merge two patch that I sended before:
> 1. msm: iommu: add missing platform_device_unregister() in err case
> 2. msm: iommu: no need kfree before kzalloc successful
> 
> It fixes two obvious problems:
> 1. We have registered msm_iommu_driver first, and need unregister it when
> registered msm_iommu_ctx_driver fail
> 
> 2. We don`t need to kfree drvdata before kzalloc successful
> 
> Signed-off-by: Libo Chen <libo.chen@...wei.com>
> ---
>  drivers/iommu/msm_iommu_dev.c |   11 +++++------
>  1 files changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iommu/msm_iommu_dev.c b/drivers/iommu/msm_iommu_dev.c
> index 8e8fb07..bae0b23 100644
> --- a/drivers/iommu/msm_iommu_dev.c
> +++ b/drivers/iommu/msm_iommu_dev.c
> @@ -292,22 +292,20 @@ static int msm_iommu_ctx_probe(struct platform_device *pdev)
>  	struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL;
>  	int i, ret;
>  	if (!c || !pdev->dev.parent) {
> -		ret = -EINVAL;
> -		goto fail;
> +		return -EINVAL;
>  	}
> 
>  	drvdata = dev_get_drvdata(pdev->dev.parent);
> 
>  	if (!drvdata) {
> -		ret = -ENODEV;
> -		goto fail;
> +		return -ENODEV;
>  	}
> 
>  	ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
>  	if (!ctx_drvdata) {
> -		ret = -ENOMEM;
> -		goto fail;
> +		return -ENOMEM;
>  	}
> +
>  	ctx_drvdata->num = c->num;
>  	ctx_drvdata->pdev = pdev;
> 
> @@ -401,6 +399,7 @@ static int __init msm_iommu_driver_init(void)
> 
>  	ret = platform_driver_register(&msm_iommu_ctx_driver);
>  	if (ret != 0) {
> +		platform_driver_unregister(&msm_iommu_driver);
>  		pr_err("Failed to register IOMMU context driver\n");
>  		goto error;
>  	}
> 


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