linux-kernel - Re: [PATCH] USB: OHCI: Check the overrides pointer for NULL in ohci_init

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Date:	Sat, 28 Sep 2013 23:00:27 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tomasz Figa <tomasz.figa@...il.com>
cc:	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] USB: OHCI: Check the overrides pointer for NULL in
 ohci_init_driver()

On Sat, 28 Sep 2013, Tomasz Figa wrote:

> A series of commit starting at
> 
> 50a97e059b USB: OHCI: make ohci-exynos a separate driver
> 
> and ending at
> 
> b8ad5c3706 USB: OHCI: make ohci-pxa27x a separate driver
> 
> introduced the concept of separate OHCI drivers for particular
> controllers. Respective drivers need to call ohci_init_driver() to
> initialize hc_driver struct with generic data and to certain extent
> with platform specific overrides through ohci_driver_overrides struct
> passed as second argument to this function. However the code does not
> check if the ohci_driver_overrides struct pointer is non-NULL, which
> leads for a NULL pointer dereference for drivers that do not need any
> overrides.
> 
> This patch fixes the problem by dereferencing the passed pointer to
> ohci_driver_overrides struct only if it is non-NULL.
> 
> Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>
> ---
>  drivers/usb/host/ohci-hcd.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
> index 21d937a..8ada13f 100644
> --- a/drivers/usb/host/ohci-hcd.c
> +++ b/drivers/usb/host/ohci-hcd.c
> @@ -1161,10 +1161,12 @@ void ohci_init_driver(struct hc_driver *drv,
>  	/* Copy the generic table to drv and then apply the overrides */
>  	*drv = ohci_hc_driver;
>  
> -	drv->product_desc = over->product_desc;
> -	drv->hcd_priv_size += over->extra_priv_size;
> -	if (over->reset)
> -		drv->reset = over->reset;
> +	if (over) {
> +		drv->product_desc = over->product_desc;
> +		drv->hcd_priv_size += over->extra_priv_size;
> +		if (over->reset)
> +			drv->reset = over->reset;
> +	}
>  }
>  EXPORT_SYMBOL_GPL(ohci_init_driver);

You were scooped by Kevin Hilman:

	http://marc.info/?l=linux-usb&m=138029463906143&w=2

Alan Stern

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