netdev - Re: [PATCH net-next] net: mscc: ocelot: check return value after calling platform_get

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Date:   Fri, 4 Jun 2021 18:07:18 +0800
From:   "weiyongjun (A)" <weiyongjun1@...wei.com>
To:     Yang Yingliang <yangyingliang@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "vladimir.oltean@....com" <vladimir.oltean@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>
Subject: Re: [PATCH net-next] net: mscc: ocelot: check return value after
 calling platform_get_resource()


> It will cause null-ptr-deref if platform_get_resource() returns NULL,
> we need check the return value.
>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>   drivers/net/dsa/ocelot/seville_vsc9953.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/dsa/ocelot/seville_vsc9953.c b/drivers/net/dsa/ocelot/seville_vsc9953.c
> index 84f93a874d50..b514e2d05b6f 100644
> --- a/drivers/net/dsa/ocelot/seville_vsc9953.c
> +++ b/drivers/net/dsa/ocelot/seville_vsc9953.c
> @@ -1206,6 +1206,10 @@ static int seville_probe(struct platform_device *pdev)
>   	felix->info = &seville_info_vsc9953;
>   
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		err = -EINVAL;
> +		dev_err(&pdev->dev, "Invalid resource\n");


should 'goto err_alloc_felix;'


> +	}
>   	felix->switch_base = res->start;
>   
>   	ds = kzalloc(sizeof(struct dsa_switch), GFP_KERNEL);