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drm/amd/display: Add null check for top_pipe_to_program in commit_planes_for_stream

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[ Upstream commit 66d71a72539e173a9b00ca0b1852cbaa5f5bf1ad ]

This commit addresses a null pointer dereference issue in the
`commit_planes_for_stream` function at line 4140. The issue could occur
when `top_pipe_to_program` is null.

The fix adds a check to ensure `top_pipe_to_program` is not null before
accessing its stream_res. This prevents a null pointer dereference.

Reported by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:4140 commit_planes_for_stream() error: we previously assumed 'top_pipe_to_program' could be null (see line 3906)

Cc: Tom Chung <chiahsuan.chung@amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Roman Li <roman.li@amd.com>
Cc: Alex Hung <alex.hung@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Srinivasan Shanmugam 2024-07-25 07:23:48 +05:30 committed by Greg Kroah-Hartman
parent de9e7f6876
commit 1ebfa66638
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -2614,7 +2614,8 @@ static void commit_planes_for_stream(struct dc *dc,
dc->hwss.pipe_control_lock(dc, top_pipe_to_program, false); dc->hwss.pipe_control_lock(dc, top_pipe_to_program, false);
if ((update_type != UPDATE_TYPE_FAST) && stream->update_flags.bits.dsc_changed) if ((update_type != UPDATE_TYPE_FAST) && stream->update_flags.bits.dsc_changed)
if (top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) { if (top_pipe_to_program &&
top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) {
top_pipe_to_program->stream_res.tg->funcs->wait_for_state( top_pipe_to_program->stream_res.tg->funcs->wait_for_state(
top_pipe_to_program->stream_res.tg, top_pipe_to_program->stream_res.tg,
CRTC_STATE_VACTIVE); CRTC_STATE_VACTIVE);