linux-kernel - Re: [PATCH] zd1211rw, fix oops when ejecting install media

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Message-ID: <4713498E.8040305@gentoo.org>
Date:	Mon, 15 Oct 2007 12:05:50 +0100
From:	Daniel Drake <dsd@...too.org>
To:	John Linville <linville@...driver.com>
CC:	Marc Pignat <marc.pignat@...s.ch>, linux-wireless@...r.kernel.org,
	kune@...ne-taler.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zd1211rw, fix oops when ejecting install media

Marc Pignat wrote:
> The disconnect function can dereference the net_device structure before it is
> allocated. This is the case when ejecting the device installer.
> 
> Signed-off-by: Marc Pignat <marc.pignat@...s.ch>

s/before it is allocated/when it is never allocated/

Acked-by: Daniel Drake <dsd@...too.org>

> ---
> 
> Hello!
> 
> Patch against 2.6.23.
> This patch fixes the bug I've submitted to linux-wireless friday in the
> "zd1211rw on 2.6.23 oops ejecting device" thread.
> 
> Regards
> 
> Marc
> 
> --- drivers/net/wireless/zd1211rw/zd_usb.c.orig	2007-10-15 08:29:16.000000000 +0200
> +++ drivers/net/wireless/zd1211rw/zd_usb.c	2007-10-15 08:29:32.000000000 +0200
> @@ -1041,14 +1041,17 @@ error:
>  static void disconnect(struct usb_interface *intf)
>  {
>  	struct net_device *netdev = zd_intf_to_netdev(intf);
> -	struct zd_mac *mac = zd_netdev_mac(netdev);
> -	struct zd_usb *usb = &mac->chip.usb;
> +	struct zd_mac *mac;
> +	struct zd_usb *usb;
>  
>  	/* Either something really bad happened, or we're just dealing with
>  	 * a DEVICE_INSTALLER. */
>  	if (netdev == NULL)
>  		return;
>  
> +	mac = zd_netdev_mac(netdev);
> +	usb = &mac->chip.usb;
> +
>  	dev_dbg_f(zd_usb_dev(usb), "\n");
>  
>  	zd_netdev_disconnect(netdev);
> 
> 

-
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