linux-kernel - Re: [linux-usb-devel] drivers/usb/gadget/ether.c: NULL dereference

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Message-ID: <20061112122332.GG25057@stusta.de>
Date:	Sun, 12 Nov 2006 13:23:32 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-usb-devel@...ts.sourceforge.net, greg@...ah.com,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [linux-usb-devel] drivers/usb/gadget/ether.c: NULL dereference

On Sat, Nov 11, 2006 at 11:10:17PM -0800, David Brownell wrote:
> 
> > 
> > void dev_kfree_skb_any(struct sk_buff *skb)
> > {
> >         if (in_irq() || irqs_disabled())
> >                 dev_kfree_skb_irq(skb);
> >         else
> >                 dev_kfree_skb(skb);
> > }
> > 
> > 
> > And the first thing dev_kfree_skb_irq() does is to dereference skb...
> 
> Yet dev_kfree_skb() --> kfree_skb() starts with the standard idiom
> 
> 	if (unlikely(!skb))
> 		return
> 
> Seems to me that the finger of blame is more appropriately pointed
> at either dev_kfree_skb_any() or dev_kfree_skb_irq() ...
>...

Adding the net maintainers to the Cc:
Is there any reason why dev_kfree_skb_irq() has no NULL check for "skb"?

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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