linux-kernel - Re: [PATCH] Usb: host - Fix possible NULL derefrence.

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Message-ID: <20170130064521.GC4324@kroah.com>
Date:   Mon, 30 Jan 2017 07:45:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Shailendra Verma <shailendra.v@...sung.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>,
        linux-usb@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, p.shailesh@...sung.com,
        ashish.kalra@...sung.com,
        Shailendra Verma <shailendra.capricorn@...il.com>
Subject: Re: [PATCH] Usb: host - Fix possible NULL derefrence.

On Mon, Jan 30, 2017 at 10:36:29AM +0530, Shailendra Verma wrote:
> of_device_get_match_data could return NULL, and so can cause
> a NULL pointer dereference later.
> 
> Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
> ---
>  drivers/usb/host/xhci-tegra.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index a59fafb..890c778 100644
> --- a/drivers/usb/host/xhci-tegra.c
> +++ b/drivers/usb/host/xhci-tegra.c
> @@ -903,6 +903,10 @@ static int tegra_xusb_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	tegra->soc = of_device_get_match_data(&pdev->dev);
> +	if (!tegra->soc) {

How would the driver be loaded and the probe function called if this
returns NULL?

Is this ever possible?

thanks,

greg k-h