Re: [PATCH net] ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()

Eric Dumazet
2026-04-03T21:51:21Z

On Fri, Apr 3, 2026 at 2:50 PM Jakub Kicinski <kuba@kernel.org> wrote:
>
> On Fri, 3 Apr 2026 14:47:32 -0700 Eric Dumazet wrote:
> > > If the ingress device has more RX queues than the egress device (dev) has
> > > TX queues, skb_get_queue_mapping(skb) will exceed dev->num_tx_queues.
> > >
> > > Since skb_get_tx_queue() does not clamp the index, will it return an
> > > out-of-bounds pointer into the egress device's dev->_tx array, causing
> > > dereferencing queue->qdisc to read invalid memory?
> >
> > This seems a different bug ?
> >
> > I mean, do we need to fix all bug in a single patch ?
>
> no no, sorry, i'm just sending this out for Justin or you as a separate
> thing.

Ah ok, thanks for the clarification :)