linux-kernel - Re: [PATCH v2] usb: host: ohci-tmio: check return value after calling platform_get

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Message-ID: <20210916141002.GA232429@rowland.harvard.edu>
Date:   Thu, 16 Sep 2021 10:10:02 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v2] usb: host: ohci-tmio: check return value after
 calling platform_get_resource()

On Thu, Sep 16, 2021 at 11:13:17AM +0800, Yang Yingliang wrote:
> 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>
> ---

Acked-by: Alan Stern <stern@...land.harvard.edu>

>  drivers/usb/host/ohci-tmio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/ohci-tmio.c b/drivers/usb/host/ohci-tmio.c
> index 08ec2ab0d95a..3f3d62dc0674 100644
> --- a/drivers/usb/host/ohci-tmio.c
> +++ b/drivers/usb/host/ohci-tmio.c
> @@ -199,7 +199,7 @@ static int ohci_hcd_tmio_drv_probe(struct platform_device *dev)
>  	if (usb_disabled())
>  		return -ENODEV;
>  
> -	if (!cell)
> +	if (!cell || !regs || !config || !sram)
>  		return -EINVAL;
>  
>  	if (irq < 0)
> -- 
> 2.25.1
>