linux-kernel - Re: [PATCH v2] libnvdimm/of_pmem: Fix memory leak in of_pmem_region

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Message-ID: <20221123155423.moztu4jdxkbmofp6@tarunpc.in.ibm.com>
Date:   Wed, 23 Nov 2022 21:24:23 +0530
From:   Tarun Sahu <tsahu@...ux.ibm.com>
To:     Xiu Jianfeng <xiujianfeng@...wei.com>
Cc:     oohall@...il.com, dan.j.williams@...el.com,
        vishal.l.verma@...el.com, dave.jiang@...el.com,
        ira.weiny@...el.com, aneesh.kumar@...ux.ibm.com,
        nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] libnvdimm/of_pmem: Fix memory leak in
 of_pmem_region_probe()

Hi,

Look all good to me.

Reviewed-by: Tarun Sahu <tsahu@...ux.ibm.com>

On Nov 23 2022, Xiu Jianfeng wrote:
> After changes in commit 49bddc73d15c ("libnvdimm/of_pmem: Provide a unique
> name for bus provider"), @priv->bus_desc.provider_name is no longer a
> const string, but a dynamic string allocated by kstrdup(), it should be
> freed on the error path, and when driver is removed.
> 
> Fixes: 49bddc73d15c ("libnvdimm/of_pmem: Provide a unique name for bus provider")
> Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
> ---
> v2: check the return value of kstrdup();
> ---
>  drivers/nvdimm/of_pmem.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
> index 10dbdcdfb9ce..08e7f2502479 100644
> --- a/drivers/nvdimm/of_pmem.c
> +++ b/drivers/nvdimm/of_pmem.c
> @@ -31,11 +31,16 @@ static int of_pmem_region_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	priv->bus_desc.provider_name = kstrdup(pdev->name, GFP_KERNEL);
> +	if (!priv->bus_desc.provider_name) {
> +		kfree(priv);
> +		return -ENOMEM;
> +	}
>  	priv->bus_desc.module = THIS_MODULE;
>  	priv->bus_desc.of_node = np;
>  
>  	priv->bus = bus = nvdimm_bus_register(&pdev->dev, &priv->bus_desc);
>  	if (!bus) {
> +		kfree(priv->bus_desc.provider_name);
>  		kfree(priv);
>  		return -ENODEV;
>  	}
> @@ -83,6 +88,7 @@ static int of_pmem_region_remove(struct platform_device *pdev)
>  	struct of_pmem_private *priv = platform_get_drvdata(pdev);
>  
>  	nvdimm_bus_unregister(priv->bus);
> +	kfree(priv->bus_desc.provider_name);
>  	kfree(priv);
>  
>  	return 0;
> -- 
> 2.17.1
>