[PATCH] drm/amd/display: Fix NULL ptr deref for commit_planes_to_stream

Deucher, Alexander Alexander.Deucher at amd.com
Fri Nov 30 15:13:00 UTC 2018

Acked-by: Alex Deucher <alexander.deucher at amd.com>

From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Sent: Friday, November 30, 2018 10:09:28 AM
To: amd-gfx at lists.freedesktop.org
Cc: Li, Sun peng (Leo); Wentland, Harry; Kazlauskas, Nicholas
Subject: [PATCH] drm/amd/display: Fix NULL ptr deref for commit_planes_to_stream

With scaling, underscan and abm changes we can end up calling
commit_planes_to_stream in commit_tail. This call uses dm_state->context
which can be NULL if the commit was a fast update.

Use dc_state instead since that can't be NULL unless the system ran
out of memory.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108912
Fixes: e64abff2f133 ("drm/amd/display: Use private obj helpers for dm_atomic_state")

Cc: Leo Li <sunpeng.li at amd.com>
Cc: Harry Wentland <harry.wentland at amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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 76b1aebdca0c..8ecd78657d43 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5011,7 +5011,7 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
-                               dm_state->context))
+                               dc_state))
                         dm_error("%s: Failed to update stream scaling!\n", __func__);


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