6.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Hung <alex.hung@xxxxxxx> [ Upstream commit 01eb50e53c1ce505bf449348d433181310288765 ] [WHY] find_disp_cfg_idx_by_plane_id and find_disp_cfg_idx_by_stream_id returns an array index and they return -1 when not found; however, -1 is not a valid index number. [HOW] When this happens, call ASSERT(), and return a positive number (which is fewer than callers' array size) instead. This fixes 4 OVERRUN and 2 NEGATIVE_RETURNS issues reported by Coverity. Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx> Acked-by: Wayne Lin <wayne.lin@xxxxxxx> Signed-off-by: Alex Hung <alex.hung@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c b/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c index a52c594e1ba4b..e1f1b5dd13203 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c +++ b/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c @@ -88,7 +88,8 @@ static int find_disp_cfg_idx_by_plane_id(struct dml2_dml_to_dc_pipe_mapping *map return i; } - return -1; + ASSERT(false); + return __DML2_WRAPPER_MAX_STREAMS_PLANES__; } static int find_disp_cfg_idx_by_stream_id(struct dml2_dml_to_dc_pipe_mapping *mapping, unsigned int stream_id) @@ -100,7 +101,8 @@ static int find_disp_cfg_idx_by_stream_id(struct dml2_dml_to_dc_pipe_mapping *ma return i; } - return -1; + ASSERT(false); + return __DML2_WRAPPER_MAX_STREAMS_PLANES__; } // The master pipe of a stream is defined as the top pipe in odm slice 0 -- 2.43.0
