linux-kernel - Re: [PATCH] usb: cdns3: fix NULL pointer dereference on no platform data

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Date:   Tue, 24 Nov 2020 06:49:27 +0000
From:   Peter Chen <peter.chen@....com>
To:     Roger Quadros <rogerq@...com>
CC:     "pawell@...ence.com" <pawell@...ence.com>,
        "balbi@...nel.org" <balbi@...nel.org>, "nm@...com" <nm@...com>,
        "nsekhar@...com" <nsekhar@...com>,
        "a-govindraju@...com" <a-govindraju@...com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: cdns3: fix NULL pointer dereference on no platform
 data

On 20-11-23 12:49:31, Roger Quadros wrote:
> Some platforms (e.g. TI) will not have any platform data which will
> lead to NULL pointer dereference if we don't check for NULL pdata.
> 
> Fixes: a284b7fd1b8f ("usb: cdns3: add quirk for enable runtime pm by default")
> Reported-by: Nishanth Menon <nm@...com>
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  drivers/usb/cdns3/core.c | 2 +-
>  drivers/usb/cdns3/host.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
> index 54d841aa626f..0f08aebce86d 100644
> --- a/drivers/usb/cdns3/core.c
> +++ b/drivers/usb/cdns3/core.c
> @@ -559,7 +559,7 @@ static int cdns3_probe(struct platform_device *pdev)
>  	device_set_wakeup_capable(dev, true);
>  	pm_runtime_set_active(dev);
>  	pm_runtime_enable(dev);
> -	if (!(cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
> +	if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
>  		pm_runtime_forbid(dev);
>  
>  	/*
> diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
> index 08103785a17a..ec89f2e5430f 100644
> --- a/drivers/usb/cdns3/host.c
> +++ b/drivers/usb/cdns3/host.c
> @@ -59,7 +59,7 @@ static int __cdns3_host_init(struct cdns3 *cdns)
>  		goto err1;
>  	}
>  
> -	if (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)
> +	if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
>  		cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
>  
>  	ret = platform_device_add_data(xhci, cdns->xhci_plat_data,

Thanks for fixing it, already applied to -next tree.

-- 

Thanks,
Peter Chen