linux-kernel - Re: [PATCH] sb1000: prevent a potential NULL pointer dereference in sb1000_dev

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Message-Id: <200707292048.20531.mb@bu3sch.de>
Date:	Sun, 29 Jul 2007 20:48:20 +0200
From:	Michael Buesch <mb@...sch.de>
To:	Satyam Sharma <satyam@...radead.org>
Cc:	Domen Puncer <domen@...erock.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, Steven Hirsch <shirsch@...lphia.net>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] sb1000: prevent a potential NULL pointer dereference in sb1000_dev_ioctl()

On Sunday 29 July 2007 20:34:46 Satyam Sharma wrote:
> (2) !(dev->flags & IFF_UP) is bogus because the functions of this ioctl
> can (and should) be allowed even when the interface is not up and running.

Are you _sure_? This function does poke with the device hardware.
It might return crap or even machinecheck when not initialized.
Hardware is probably powered down, if not IFF_UP. (I don't know if that's
the case here, though).

>  drivers/net/sb1000.c |    3 ---
>  1 files changed, 0 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/sb1000.c b/drivers/net/sb1000.c
> index 1de3eec..f60fe98 100644
> --- a/drivers/net/sb1000.c
> +++ b/drivers/net/sb1000.c
> @@ -993,9 +993,6 @@ static int sb1000_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
>  	unsigned int stats[5];
>  	struct sb1000_private *lp = netdev_priv(dev);
>  
> -	if (!(dev && dev->flags & IFF_UP))
> -		return -ENODEV;
> -


-- 
Greetings Michael.
-
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