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[PATCH v2] drm/msm/dpu: check dpu_plane_atomic_print_state() for valid sspp

Abhinav Kumar posted 1 patch 2 weeks, 1 day ago 
drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
[PATCH v2] drm/msm/dpu: check dpu_plane_atomic_print_state() for valid sspp
Posted by Abhinav Kumar 2 weeks, 1 day ago 
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@chromium.org>
Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/67
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
---
To: Rob Clark <robdclark@gmail.com>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Sean Paul <sean@poorly.run>
To: Marijn Suijten <marijn.suijten@somainline.org>
To: David Airlie <airlied@gmail.com>
To: Simona Vetter <simona@ffwll.ch>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: Stephen Boyd <swboyd@chromium.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(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 3ffac24333a2a5b01135d4ece418432d4a74dc04..703e58901d53f26eba69566c2784655015c6a584 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -1335,12 +1335,15 @@ static void dpu_plane_atomic_print_state(struct drm_printer *p,
 
 	drm_printf(p, "\tstage=%d\n", pstate->stage);
 
-	drm_printf(p, "\tsspp[0]=%s\n", pipe->sspp->cap->name);
-	drm_printf(p, "\tmultirect_mode[0]=%s\n", dpu_get_multirect_mode(pipe->multirect_mode));
-	drm_printf(p, "\tmultirect_index[0]=%s\n",
-		   dpu_get_multirect_index(pipe->multirect_index));
-	drm_printf(p, "\tsrc[0]=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&pipe_cfg->src_rect));
-	drm_printf(p, "\tdst[0]=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&pipe_cfg->dst_rect));
+	if (pipe->sspp) {
+		drm_printf(p, "\tsspp[0]=%s\n", pipe->sspp->cap->name);
+		drm_printf(p, "\tmultirect_mode[0]=%s\n",
+			   dpu_get_multirect_mode(pipe->multirect_mode));
+		drm_printf(p, "\tmultirect_index[0]=%s\n",
+			   dpu_get_multirect_index(pipe->multirect_index));
+		drm_printf(p, "\tsrc[0]=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&pipe_cfg->src_rect));
+		drm_printf(p, "\tdst[0]=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&pipe_cfg->dst_rect));
+	}
 
 	if (r_pipe->sspp) {
 		drm_printf(p, "\tsspp[1]=%s\n", r_pipe->sspp->cap->name);

---
base-commit: 9d6a414ad31e8eb296cd6f2c1834b2c6994960a0
change-id: 20241209-check-state-before-dump-2a015ace5f49

Best regards,
-- 
Abhinav Kumar <quic_abhinavk@quicinc.com>
Re: [PATCH v2] drm/msm/dpu: check dpu_plane_atomic_print_state() for valid sspp
Posted by Stephen Boyd 2 weeks ago 
Quoting Abhinav Kumar (2024-12-11 11:50:26)
> 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@chromium.org>
> Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/67
> Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
> ---

Tested-by: Stephen Boyd <swboyd@chromium.org> # sc7180-trogdor
Re: [PATCH v2] drm/msm/dpu: check dpu_plane_atomic_print_state() for valid sspp
Posted by Doug Anderson 2 weeks, 1 day ago 
Hi,

On Wed, Dec 11, 2024 at 11:51 AM Abhinav Kumar
<quic_abhinavk@quicinc.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@chromium.org>
> Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/67
> Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
> ---
> To: Rob Clark <robdclark@gmail.com>
> To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> To: Sean Paul <sean@poorly.run>
> To: Marijn Suijten <marijn.suijten@somainline.org>
> To: David Airlie <airlied@gmail.com>
> To: Simona Vetter <simona@ffwll.ch>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: dri-devel@lists.freedesktop.org
> Cc: freedreno@lists.freedesktop.org
> Cc: linux-kernel@vger.kernel.org
> Cc: Stephen Boyd <swboyd@chromium.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@chromium.org>
Re: [PATCH v2] drm/msm/dpu: check dpu_plane_atomic_print_state() for valid sspp
Posted by Dmitry Baryshkov 2 weeks, 1 day ago 
On Wed, Dec 11, 2024 at 11:50:26AM -0800, Abhinav Kumar 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@chromium.org>
> Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/67
> Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
> ---
> To: Rob Clark <robdclark@gmail.com>
> To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> To: Sean Paul <sean@poorly.run>
> To: Marijn Suijten <marijn.suijten@somainline.org>
> To: David Airlie <airlied@gmail.com>
> To: Simona Vetter <simona@ffwll.ch>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: dri-devel@lists.freedesktop.org
> Cc: freedreno@lists.freedesktop.org
> Cc: linux-kernel@vger.kernel.org
> Cc: Stephen Boyd <swboyd@chromium.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(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

Patchew 2.1-devel-b67e4c2

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