Bug#1118437: null pointer dereference in interrupt after receiving an ip packet on veth from xsk from user space

[mc36 <csmate@nop.hu>]

hi,

you both are crazy good, thank you so much for both of your effort! :)


if you're in a need for some more complicated xsk tests, just let me know, freertr

have a dataplane and a socat-alike tool with an xsk based packetio for a while....

br,

cs

On 10/21/25 14:25, Jason Xing wrote:
> On Tue, Oct 21, 2025 at 6:52   PM Fernando Fernandez Mancera
> <fmancera@suse.de> wrote:
> > On 10/20/25 11:31 PM, mc36 wrote:
> > > hi,
> > >
> > > On 10/20/25 11:04, Jason Xing wrote:
> > > > I followed your steps you attached in your code:
> > > > ////// gcc xskInt.c -lxdp
> > > > ////// sudo ip link add veth1 type veth
> > > > ////// sudo ip link set veth0 up
> > > > ////// sudo ip link set veth1 up
> > >
> > > ip link set dev veth1 address 3a:10:5c:53:b3:5c
> > >
> > > > ////// sudo ./a.out
> > > that will do the trick on a recent kerlek....
> > >
> > > its the destination mac in the c code....
> > >
> > > ps: chaining in the original reporter from the fedora land.....
> > >
> > >
> > > have a nice day,
> > >
> > > cs
> >
> > hi, FWIW I have reproduced this and I bisected it, issue was introduced
> > at 30f241fcf52aaaef7ac16e66530faa11be78a865 - working on a patch.
>
> Exactly. I simply reverted it and its dependencies and didn't see any
> crash then. It was newly introduced, hopefully it will not bring much
> trouble. As I replied before, I will take a look tomorrow morning.
>
> Thanks,
> Jason