Re: Null pointer dereference in nf_nat_move_storage(), kernel 2.6.23.1

[David Miller <davem@davemloft.net>]

From: Patrick McHardy <kaber@trash.net>
Date: Fri, 16 Nov 2007 01:00:22 +0100

> David Miller wrote:
> > From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
> > Date: Thu, 15 Nov 2007 15:06:59 +0300
> >
> >> Please test attached patch.
> >>
> >> This routing is called each time hash should be replaced, nf_conn has
> >> extension list which contains pointers to connection tracking users
> >> (like nat, which is right now the only such user), so when replace takes
> >> place it should copy own extensions. Loop above checks for own
> >> extension, but tries to move higer-layer one, which can lead to above
> >> oops.
> >>
> >> Not tested, derived from code observation only.
> >>
> >> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
> >
> > It looks extremely correct to me.  Therefore I'm going to apply
> > this and queue it up for -stable.
> >
> > Thanks Evgeniy, keep up the excellent work!
> >
> > Patrick, please let me know if you have any objections.
> 
> The patch looks fine, thanks. I was just waiting for confirmation
> from Chuck.

I have to hold off the -stable submission until it hits
Linus's tree anyways, so I'll make sure we see test feedback
by that time as well.