linux-kernel - Re: Fix null pointer dereference in appledisplay driver

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Date:	Sat, 10 Feb 2007 00:39:20 -0500
From:	Len Brown <lenb@...nel.org>
To:	Michael Hanselmann <linux-kernel@...smi.ch>,
	linux-acpi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	cappaberra@...il.com
Subject: Re: Fix null pointer dereference in appledisplay driver

Applied.

thanks,
-Len

On Friday 09 February 2007 19:18, Michael Hanselmann wrote:
> Commit 40b20c257a13c5a526ac540bc5e43d0fdf29792a by Len Brown introduced
> a null pointer dereference in the appledisplay driver. This patch fixes
> it.
> 
> Signed-off-by: Michael Hanselmann <linux-kernel@...smi.ch>
> 
> ---
> I suggest adding this to 2.6.20.1 because this bug causes the kernel to
> panic on boot when the driver is compiled in.
> 
> diff -Nrup --exclude-from linux-exclude-from linux-2.6.20.orig/drivers/usb/misc/appledisplay.c linux-2.6.20/drivers/usb/misc/appledisplay.c
> --- linux-2.6.20.orig/drivers/usb/misc/appledisplay.c	2007-02-09 22:35:56.000000000 +0100
> +++ linux-2.6.20/drivers/usb/misc/appledisplay.c	2007-02-10 01:00:28.000000000 +0100
> @@ -281,8 +281,8 @@ static int appledisplay_probe(struct usb
>  	/* Register backlight device */
>  	snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
>  		atomic_inc_return(&count_displays) - 1);
> -	pdata->bd = backlight_device_register(bl_name, NULL, NULL,
> -						&appledisplay_bl_data);
> +	pdata->bd = backlight_device_register(bl_name, NULL,
> +		pdata, &appledisplay_bl_data);
>  	if (IS_ERR(pdata->bd)) {
>  		err("appledisplay: Backlight registration failed");
>  		goto error;
> -
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