On Mon, Feb 04, 2013 at 09:41:32AM +0200, Andriy Gapon wrote:
> on 04/02/2013 02:37 Mark Johnston said the following:
> > On Sat, Feb 02, 2013 at 11:54:00AM +0000, Andriy Gapon wrote:
> >> Author: avg
> >> Date: Sat Feb 2 11:54:00 2013
> >> New Revision: 246245
> >> URL: http://svnweb.freebsd.org/changeset/base/246245
> >>
> >> Log:
> >> ng_ether: track interface renaming
> >>
> >> Also sanitize interface names that can potentially contain characters
> >> that are prohibited in netgraph names.
> >>
> >> PR: kern/154850 (sanitizing of names)
> >> Discussed with: eri, melifaro
> >> Submitted by: Nikolay Denev <nde...@gmail.com> (sanitizing code)
> >> Reviewed by: eri, glebius
> >> MFC after: 17 days
> >>
> >> Modified:
> >> head/sys/netgraph/ng_ether.c
> >>
> >
> > Hi Andriy,
> >
> > This commit seems to cause a panic during boot when creating the
> > loopback interface. I couldn't get a core dump but the problem seems to
> > happen when dereferencing ifp->if_l2com in the IFP2NG macro in
> > ng_ether_ifnet_arrival_event(). In the case of lo(4) this pointer seems
> > to be NULL (I suppose because lo(4) doesn't register itself in the
> > if_com_alloc/free tables).
> >
> > The patch below fixes the panic for me.
>
> Mark,
>
> thank you for the report and sorry for the breakage.
> Could you please try the following patch (slightly different from your patch)?
Thanks, I can confirm that this one works too.
>
> diff --git a/sys/netgraph/ng_ether.c b/sys/netgraph/ng_ether.c
> index 6266f40..05ea402 100644
> --- a/sys/netgraph/ng_ether.c
> +++ b/sys/netgraph/ng_ether.c
> @@ -410,11 +410,16 @@ static void
> ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
> {
> char name[IFNAMSIZ];
> - node_p node = IFP2NG(ifp);
> + node_p node;
> +
> + /* Only ethernet interfaces are of interest. */
> + if (ifp->if_type != IFT_ETHER)
> + return;
>
> /*
> * Just return if it's a new interface without an ng_ether companion.
> */
> + node = IFP2NG(ifp);
> if (node == NULL)
> return;
>
>
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