linux-kernel - Re: [PATCH v4 1/1] libnvdimm: fix memory leaks in of

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Date:   Sat, 19 Sep 2020 19:38:32 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Oliver O'Halloran <oohall@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Dave Jiang" <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Markus Elfring <Markus.Elfring@....de>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/1] libnvdimm: fix memory leaks in of_pmem.c

Hi, all:
  Is this patch acceptable?


On 2020/9/1 16:14, Zhen Lei wrote:
> Currently, in the last error path of of_pmem_region_probe() and in
> of_pmem_region_remove(), free the memory allocated by kstrdup() is
> missing. Add kfree(priv->bus_desc.provider_name) to fix it.
> 
> In addition, add a sanity check to kstrdup() to prevent a
> NULL-pointer dereference.
> 
> Fixes: 49bddc73d15c ("libnvdimm/of_pmem: Provide a unique name for bus provider")
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> Reviewed-by: Oliver O'Halloran <oohall@...il.com>
> ---
>  drivers/nvdimm/of_pmem.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
> index 10dbdcdfb9ce913..13c4c274ca6ea88 100644
> --- a/drivers/nvdimm/of_pmem.c
> +++ b/drivers/nvdimm/of_pmem.c
> @@ -31,11 +31,17 @@ 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 +89,7 @@ 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;
>