Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference

Nick Piggin
2008-07-24T13:14:13Z

On Thursday 24 July 2008 23:04, Herbert Xu wrote:
> On Thu, Jul 24, 2008 at 10:56:08PM +1000, Nick Piggin wrote:
> > OTOH, skb allocation uses kmalloc don't they? So you could still use
> > SLOB ksize for that I guess.
>
> Yes I was referring to the data portion which is kmalloc'ed.
> That is also why I'm interested in ksize because a priori we
> don't know exactly how big it's going to be. However, we do
> know that statistically 1500 will dominate.
>
> I'm not interested in ksize for kmem_cache at all. So in fact
> we could have something simpler that's based on kmalloc's rounding
> algorithm instead.

Yes you could definitely have a function that returns allocated
bytes for a given kmalloc size. Should be about as fast or faster
than extracting the size from the kaddr...