This is a note to let you know that I've just added the patch titled
drm/amd/display: Add null check for 'afb' in amdgpu_dm_plane_handle_cursor_update (v2)
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-add-null-check-for-afb-in-amdgpu_dm_.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit de8f58eb2956b1bf822f21ea7e619e53e0f2b996
Author: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
Date: Fri Aug 2 12:35:13 2024 +0530
drm/amd/display: Add null check for 'afb' in amdgpu_dm_plane_handle_cursor_update (v2)
[ Upstream commit cd9e9e0852d501f169aa3bb34e4b413d2eb48c37 ]
This commit adds a null check for the 'afb' variable in the
amdgpu_dm_plane_handle_cursor_update function. Previously, 'afb' was
assumed to be null, but was used later in the code without a null check.
This could potentially lead to a null pointer dereference.
Changes since v1:
- Moved the null check for 'afb' to the line where 'afb' is used. (Alex)
Fixes the below:
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_plane.c:1298 amdgpu_dm_plane_handle_cursor_update() error: we previously assumed 'afb' could be null (see line 1252)
Cc: Tom Chung <chiahsuan.chung@xxxxxxx>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Cc: Roman Li <roman.li@xxxxxxx>
Cc: Alex Hung <alex.hung@xxxxxxx>
Cc: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Co-developed-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
Reviewed-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index fa9f53b310793..d1329f20b7bd4 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -1281,7 +1281,8 @@ void amdgpu_dm_plane_handle_cursor_update(struct drm_plane *plane,
adev->dm.dc->caps.color.dpp.gamma_corr)
attributes.attribute_flags.bits.ENABLE_CURSOR_DEGAMMA = 1;
- attributes.pitch = afb->base.pitches[0] / afb->base.format->cpp[0];
+ if (afb)
+ attributes.pitch = afb->base.pitches[0] / afb->base.format->cpp[0];
if (crtc_state->stream) {
mutex_lock(&adev->dm.dc_lock);
