linux-kernel - Re: [PATCH v2] drm/msm/dpu: check dpu_plane_atomic_print

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Message-ID: <CAD=FV=V33utY6rby5e+RkRfUQQ40g2Bq3xr=G9q3if8TNoq1kg@mail.gmail.com>
Date: Wed, 11 Dec 2024 14:50:51 -0800
From: Doug Anderson <dianders@...omium.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH v2] drm/msm/dpu: check dpu_plane_atomic_print_state() for
 valid sspp

Hi,

On Wed, Dec 11, 2024 at 11:51 AM Abhinav Kumar
<quic_abhinavk@...cinc.com> wrote:
>
> Similar to the r_pipe sspp protect, add a check to protect
> the pipe state prints to avoid NULL ptr dereference for cases when
> the state is dumped without a corresponding atomic_check() where the
> pipe->sspp is assigned.
>
> Fixes: 31f7148fd370 ("drm/msm/dpu: move pstate->pipe initialization to dpu_plane_atomic_check")
> Reported-by: Stephen Boyd <swboyd@...omium.org>
> Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/67
> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> ---
> To: Rob Clark <robdclark@...il.com>
> To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> To: Sean Paul <sean@...rly.run>
> To: Marijn Suijten <marijn.suijten@...ainline.org>
> To: David Airlie <airlied@...il.com>
> To: Simona Vetter <simona@...ll.ch>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: dri-devel@...ts.freedesktop.org
> Cc: freedreno@...ts.freedesktop.org
> Cc: linux-kernel@...r.kernel.org
> Cc: Stephen Boyd <swboyd@...omium.org>
> ---
> Changes in v2:
> - move pstate->stage out of the pipe->sspp check
> - add reported-by credits for Stephen
> - Link to v1: https://lore.kernel.org/r/20241209-check-state-before-dump-v1-1-7a9d8bc6048f@quicinc.com
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)

Tested-by: Douglas Anderson <dianders@...omium.org>