* [PATCH] amdgpu/dc: Avoid dereferencing NULL pointer
@ 2017-10-27 18:34 Drew Davenport
[not found] ` <20171027183446.100536-1-ddavenport-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
0 siblings, 1 reply; 3+ messages in thread
From: Drew Davenport @ 2017-10-27 18:34 UTC (permalink / raw)
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW
Cc: Alexander.Deucher-5C7GfCeVMHo, 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 <ddavenport@chromium.org>
---
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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^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] amdgpu/dc: Avoid dereferencing NULL pointer
[not found] ` <20171027183446.100536-1-ddavenport-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
@ 2017-10-27 19:29 ` Harry Wentland
0 siblings, 0 replies; 3+ messages in thread
From: Harry Wentland @ 2017-10-27 19:29 UTC (permalink / raw)
To: Drew Davenport, amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW
Cc: Alexander.Deucher-5C7GfCeVMHo, Li, Sun peng
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 <ddavenport@chromium.org>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
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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^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH] amdgpu/dc: Avoid dereferencing NULL pointer
@ 2017-10-28 1:38 S, Shirish
0 siblings, 0 replies; 3+ messages in thread
From: S, Shirish @ 2017-10-28 1:38 UTC (permalink / raw)
To: Drew Davenport, amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW
Cc: Deucher, Alexander
> -----Original Message-----
> From: amd-gfx [mailto:amd-gfx-bounces@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.Deucher@amd.com>; Drew Davenport
> <ddavenport@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 <ddavenport@chromium.org>
Reviewed-by: Shirish S <shirish.s@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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^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-10-27 18:34 [PATCH] amdgpu/dc: Avoid dereferencing NULL pointer Drew Davenport
[not found] ` <20171027183446.100536-1-ddavenport-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2017-10-27 19:29 ` Harry Wentland
2017-10-28 1:38 S, Shirish
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