netdev - Re: [PATCH] can: Fix possible NULL pointer dereference in ems

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Message-ID: <4BCE04D9.2030601@grandegger.com>
Date:	Tue, 20 Apr 2010 21:47:37 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	"Hans J. Koch" <hjk@...utronix.de>
CC:	netdev@...r.kernel.org, socketcan-core@...ts.berlios.de
Subject: Re: [PATCH] can: Fix possible NULL pointer dereference in ems_usb.c

Hans J. Koch wrote:
> In ems_usb_probe(), a pointer is dereferenced after making sure it is NULL...
> 
> This patch replaces dev_err() with printk() to avoid this.
> 
> Signed-off-by: "Hans J. Koch" <hjk@...utronix.de>
> ---
>  drivers/net/can/usb/ems_usb.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6.34-rc/drivers/net/can/usb/ems_usb.c
> ===================================================================
> --- linux-2.6.34-rc.orig/drivers/net/can/usb/ems_usb.c	2010-04-20 15:32:25.000000000 +0200
> +++ linux-2.6.34-rc/drivers/net/can/usb/ems_usb.c	2010-04-20 15:33:20.000000000 +0200
> @@ -1006,7 +1006,7 @@
>  
>  	netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS);
>  	if (!netdev) {
> -		dev_err(netdev->dev.parent, "Couldn't alloc candev\n");
> +		printk(KERN_ERR "ems_usb: Couldn't alloc candev\n");
>  		return -ENOMEM;
>  	}

I think "dev_err(&intf->dev, ...)" should be used before
SET_NETDEV_DEV(netdev, &intf->dev) is called. I see two "dev_err()"
calls which need to be fixed.

Wolfgang.

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