[PATCH] amdgpu/dc: Avoid dereferencing NULL pointer

[S, Shirish]

> -Original Message-
> From: amd-gfx [mailto:amd-gfx-boun...@lists.freedesktop.org] On Behalf 
> Of Drew Davenport
> Sent: Saturday, October 28, 2017 12:05 AM
> To: amd-gfx@lists.freedesktop.org
> Cc: Deucher, Alexander <alexander.deuc...@amd.com>; Drew Davenport 
> <ddavenp...@chromium.org>
> Subject: [PATCH] amdgpu/dc: Avoid dereferencing NULL pointer
>
> crtc is dereferenced from within drm_atomic_get_new_crtc_state, so 
> check for NULL before initializing new_crtc_state.
>
> Signed-off-by: Drew Davenport <ddavenp...@chromium.org>
Reviewed-by: Shirish S <shiris...@amd.com>
> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c 
> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index d0ee1b3b8b5c..5a440fadbe18 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -3874,8 +3874,7 @@ static void amdgpu_dm_commit_planes(struct 
> drm_atomic_state *state,
>   /* update planes when needed */
>   for_each_oldnew_plane_in_state(state, plane, old_plane_state, 
> new_plane_state, i) {
>   struct drm_crtc *crtc = new_plane_state->crtc;
> - struct drm_crtc_state *new_crtc_state =
> - drm_atomic_get_new_crtc_state(state, crtc);
> + struct drm_crtc_state *new_crtc_state;
>   struct drm_framebuffer *fb = new_plane_state->fb;
>   bool pflip_needed;
>   struct dm_plane_state *dm_new_plane_state = 
> to_dm_plane_state(new_plane_state);
> @@ -3885,7 +3884,11 @@ static void amdgpu_dm_commit_planes(struct 
> drm_atomic_state *state,
>   continue;
>   }
>   
> - if (!fb || !crtc || pcrtc != crtc || !new_crtc_state->active)
> + if (!fb || !crtc || pcrtc != crtc)
> + continue;
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> + if (!new_crtc_state->active)
>   continue;
>   
>   pflip_needed = !state->allow_modeset;

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Re: [PATCH] amdgpu/dc: Avoid dereferencing NULL pointer

[Harry Wentland]

On 2017-10-27 02:34 PM, Drew Davenport wrote:
> crtc is dereferenced from within drm_atomic_get_new_crtc_state, so
> check for NULL before initializing new_crtc_state.
> 
> Signed-off-by: Drew Davenport 

Reviewed-by: Harry Wentland 

Harry

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c 
> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index d0ee1b3b8b5c..5a440fadbe18 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -3874,8 +3874,7 @@ static void amdgpu_dm_commit_planes(struct 
> drm_atomic_state *state,
>   /* update planes when needed */
>   for_each_oldnew_plane_in_state(state, plane, old_plane_state, 
> new_plane_state, i) {
>   struct drm_crtc *crtc = new_plane_state->crtc;
> - struct drm_crtc_state *new_crtc_state =
> - drm_atomic_get_new_crtc_state(state, crtc);
> + struct drm_crtc_state *new_crtc_state;
>   struct drm_framebuffer *fb = new_plane_state->fb;
>   bool pflip_needed;
>   struct dm_plane_state *dm_new_plane_state = 
> to_dm_plane_state(new_plane_state);
> @@ -3885,7 +3884,11 @@ static void amdgpu_dm_commit_planes(struct 
> drm_atomic_state *state,
>   continue;
>   }
>  
> - if (!fb || !crtc || pcrtc != crtc || !new_crtc_state->active)
> + if (!fb || !crtc || pcrtc != crtc)
> + continue;
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> + if (!new_crtc_state->active)
>   continue;
>  
>   pflip_needed = !state->allow_modeset;
> 
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[PATCH] amdgpu/dc: Avoid dereferencing NULL pointer

[Drew Davenport]

crtc is dereferenced from within drm_atomic_get_new_crtc_state, so
check for NULL before initializing new_crtc_state.

Signed-off-by: Drew Davenport 
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index d0ee1b3b8b5c..5a440fadbe18 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3874,8 +3874,7 @@ static void amdgpu_dm_commit_planes(struct 
drm_atomic_state *state,
/* update planes when needed */
for_each_oldnew_plane_in_state(state, plane, old_plane_state, 
new_plane_state, i) {
struct drm_crtc *crtc = new_plane_state->crtc;
-   struct drm_crtc_state *new_crtc_state =
-   drm_atomic_get_new_crtc_state(state, crtc);
+   struct drm_crtc_state *new_crtc_state;
struct drm_framebuffer *fb = new_plane_state->fb;
bool pflip_needed;
struct dm_plane_state *dm_new_plane_state = 
to_dm_plane_state(new_plane_state);
@@ -3885,7 +3884,11 @@ static void amdgpu_dm_commit_planes(struct 
drm_atomic_state *state,
continue;
}
 
-   if (!fb || !crtc || pcrtc != crtc || !new_crtc_state->active)
+   if (!fb || !crtc || pcrtc != crtc)
+   continue;
+
+   new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+   if (!new_crtc_state->active)
continue;
 
pflip_needed = !state->allow_modeset;
-- 
2.15.0.rc2.357.g7e34df9404-goog

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