Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> writes:
> Since the commit mentioned below __xdp_reg_mem_model() can return a NULL
> pointer. This pointer is dereferenced in trace_mem_connect() which leads
> to segfault.
>
> The trace points (mem_connect + mem_disconnect) were put in place to
> pair connect/disconnect using the IDs. The ID is only assigned if
> __xdp_reg_mem_model() does not return NULL. That connect trace point is
> of no use if there is no ID.
>
> Skip that connect trace point if xdp_alloc is NULL.
>
> [ Toke Høiland-Jørgensen delivered the reasoning for skipping the trace
> point ]
>
> Fixes: 4a48ef70b93b8 ("xdp: Allow registering memory model without rxq reference")
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
With Steven's fix:
Acked-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
