From: Olof Johansson <olof@lixom.net>
Date: Thu, 18 Oct 2007 21:29:47 -0500

> So, looks like rcu_dereference() returned NULL. I don't know the
> filter code at all, but it seems like it might be a valid case?
> sk_detach_filter() seems to handle a NULL sk_filter, at least.
> 
> 
> So, this needs review by someone who knows the filter, but it fixes the
> problem for me:
> 
> 
> Signed-off-by: Olof Johansson <olof@lixom.net>

I've applied this for now to my net-2.6 tree, thanks Olof
for tracking this down.

Pavel please take a look at this and let me know if it should
fixed in some other way.

Thanks!