Re: [PATCH] drm/amd/display: Fix crash in hwss_set_output_transfer_func()

["Dieter Nützel" <Dieter@nuetzel-hh.de>]

Hello Alex,

where did you commited, this?
Can't find it your trees.

By the way:

Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41557#note_3602165

Greetings,
   Dieter

PS Please CC me. I'm currently not on 'amd-devel'.


> Applied.  Thanks!
> 
> On Mon, Aug 3, 2026 at 8:58 AM Timur Kristóf <timur.kristof at 
> gmail.com> wrote:
> >
> > The pipe_ctx->plane_res.hubp pointer is NULL on all DCE
> > hardware, which causes a kernel NULL pointer dereference
> > on all Vega and older GPUs.
> >
> > Let's add a simple NULL check.
> >
> > Fixes: f879f53407f0 ("drm/amd/display: Refactor DPP_SET_OUTPUT_TRANSFER_FUNC to drop pipe_ctx")
> > Signed-off-by: Timur Kristóf <timur.kristof at gmail.com>
> > Cc: Tomasz Siemek <tomasz.siemek at amd.com>
> > ---
> >  drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c
> > index 11411fa94665..5495e493b2eb 100644
> > --- a/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c
> > +++ b/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c
> > @@ -1900,7 +1900,8 @@ void hwss_set_output_transfer_func(struct dc *dc, struct pipe_ctx *pipe_ctx)
> >                                 .xfm = pipe_ctx->plane_res.xfm,
> >                                 .dpp = pipe_ctx->plane_res.dpp,
> >                                 .mpc = dc->res_pool->mpc,
> > -                               .mpcc_id = pipe_ctx->plane_res.hubp->inst,
> > +                               .mpcc_id = pipe_ctx->plane_res.hubp ?
> > +                                               pipe_ctx->plane_res.hubp->inst : 0,
> >                                 .is_top_pipe = resource_is_pipe_type(pipe_ctx, OPP_HEAD),
> >                                 .stream = pipe_ctx->stream,
> >                         }
> > --
> > 2.55.0
> >