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

Applied.  Thanks!

On Mon, Aug 3, 2026 at 8:58 AM Timur Kristóf <[email protected]> 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 <[email protected]>
> Cc: Tomasz Siemek <[email protected]>
> ---
>  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
>