[PATCH 6.11 206/558] drm/amd/display: Check null pointers before multiple uses

6.11-stable review patch. If anyone has any objections, please let me know.

------------------

From: Alex Hung alex.hung@amd.com

[ Upstream commit fdd5ecbbff751c3b9061d8ebb08e5c96119915b4 ]

[WHAT & HOW] Poniters, such as stream_enc and dc->bw_vbios, are null checked previously in the same function, so Coverity warns "implies that stream_enc and dc->bw_vbios might be null". They are used multiple times in the subsequent code and need to be checked.

This fixes 10 FORWARD_NULL issues reported by Coverity.

Reviewed-by: Rodrigo Siqueira rodrigo.siqueira@amd.com Signed-off-by: Jerry Zuo jerry.zuo@amd.com Signed-off-by: Alex Hung alex.hung@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- .../drm/amd/display/dc/core/dc_hw_sequencer.c | 96 ++++++++++--------- .../amd/display/dc/hwss/dcn20/dcn20_hwseq.c | 8 +- .../display/dc/link/accessories/link_dp_cts.c | 5 +- .../amd/display/dc/link/hwss/link_hwss_dio.c | 5 +- .../dc/resource/dce112/dce112_resource.c | 5 +- .../dc/resource/dcn32/dcn32_resource.c | 3 + .../resource/dcn32/dcn32_resource_helpers.c | 10 +- 7 files changed, 76 insertions(+), 56 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c index 87e36d51c56d8..4a88412fdfab1 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c @@ -636,57 +636,59 @@ void hwss_build_fast_sequence(struct dc *dc, while (current_pipe) { current_mpc_pipe = current_pipe; while (current_mpc_pipe) { - if (dc->hwss.set_flip_control_gsl && current_mpc_pipe->plane_state && current_mpc_pipe->plane_state->update_flags.raw) { - block_sequence[*num_steps].params.set_flip_control_gsl_params.pipe_ctx = current_mpc_pipe; - block_sequence[*num_steps].params.set_flip_control_gsl_params.flip_immediate = current_mpc_pipe->plane_state->flip_immediate; - block_sequence[*num_steps].func = HUBP_SET_FLIP_CONTROL_GSL; - (*num_steps)++; - } - if (dc->hwss.program_triplebuffer && dc->debug.enable_tri_buf && current_mpc_pipe->plane_state->update_flags.raw) { - block_sequence[*num_steps].params.program_triplebuffer_params.dc = dc; - block_sequence[*num_steps].params.program_triplebuffer_params.pipe_ctx = current_mpc_pipe; - block_sequence[*num_steps].params.program_triplebuffer_params.enableTripleBuffer = current_mpc_pipe->plane_state->triplebuffer_flips; - block_sequence[*num_steps].func = HUBP_PROGRAM_TRIPLEBUFFER; - (*num_steps)++; - } - if (dc->hwss.update_plane_addr && current_mpc_pipe->plane_state->update_flags.bits.addr_update) { - if (resource_is_pipe_type(current_mpc_pipe, OTG_MASTER) && - stream_status->mall_stream_config.type == SUBVP_MAIN) { - block_sequence[*num_steps].params.subvp_save_surf_addr.dc_dmub_srv = dc->ctx->dmub_srv; - block_sequence[*num_steps].params.subvp_save_surf_addr.addr = &current_mpc_pipe->plane_state->address; - block_sequence[*num_steps].params.subvp_save_surf_addr.subvp_index = current_mpc_pipe->subvp_index; - block_sequence[*num_steps].func = DMUB_SUBVP_SAVE_SURF_ADDR; + if (current_mpc_pipe->plane_state) { + if (dc->hwss.set_flip_control_gsl && current_mpc_pipe->plane_state->update_flags.raw) { + block_sequence[*num_steps].params.set_flip_control_gsl_params.pipe_ctx = current_mpc_pipe; + block_sequence[*num_steps].params.set_flip_control_gsl_params.flip_immediate = current_mpc_pipe->plane_state->flip_immediate; + block_sequence[*num_steps].func = HUBP_SET_FLIP_CONTROL_GSL; + (*num_steps)++; + } + if (dc->hwss.program_triplebuffer && dc->debug.enable_tri_buf && current_mpc_pipe->plane_state->update_flags.raw) { + block_sequence[*num_steps].params.program_triplebuffer_params.dc = dc; + block_sequence[*num_steps].params.program_triplebuffer_params.pipe_ctx = current_mpc_pipe; + block_sequence[*num_steps].params.program_triplebuffer_params.enableTripleBuffer = current_mpc_pipe->plane_state->triplebuffer_flips; + block_sequence[*num_steps].func = HUBP_PROGRAM_TRIPLEBUFFER; + (*num_steps)++; + } + if (dc->hwss.update_plane_addr && current_mpc_pipe->plane_state->update_flags.bits.addr_update) { + if (resource_is_pipe_type(current_mpc_pipe, OTG_MASTER) && + stream_status->mall_stream_config.type == SUBVP_MAIN) { + block_sequence[*num_steps].params.subvp_save_surf_addr.dc_dmub_srv = dc->ctx->dmub_srv; + block_sequence[*num_steps].params.subvp_save_surf_addr.addr = &current_mpc_pipe->plane_state->address; + block_sequence[*num_steps].params.subvp_save_surf_addr.subvp_index = current_mpc_pipe->subvp_index; + block_sequence[*num_steps].func = DMUB_SUBVP_SAVE_SURF_ADDR; + (*num_steps)++; + } + + block_sequence[*num_steps].params.update_plane_addr_params.dc = dc; + block_sequence[*num_steps].params.update_plane_addr_params.pipe_ctx = current_mpc_pipe; + block_sequence[*num_steps].func = HUBP_UPDATE_PLANE_ADDR; (*num_steps)++; }

- block_sequence[*num_steps].params.update_plane_addr_params.dc = dc; - block_sequence[*num_steps].params.update_plane_addr_params.pipe_ctx = current_mpc_pipe; - block_sequence[*num_steps].func = HUBP_UPDATE_PLANE_ADDR; - (*num_steps)++; - } - - if (hws->funcs.set_input_transfer_func && current_mpc_pipe->plane_state->update_flags.bits.gamma_change) { - block_sequence[*num_steps].params.set_input_transfer_func_params.dc = dc; - block_sequence[*num_steps].params.set_input_transfer_func_params.pipe_ctx = current_mpc_pipe; - block_sequence[*num_steps].params.set_input_transfer_func_params.plane_state = current_mpc_pipe->plane_state; - block_sequence[*num_steps].func = DPP_SET_INPUT_TRANSFER_FUNC; - (*num_steps)++; - } + if (hws->funcs.set_input_transfer_func && current_mpc_pipe->plane_state->update_flags.bits.gamma_change) { + block_sequence[*num_steps].params.set_input_transfer_func_params.dc = dc; + block_sequence[*num_steps].params.set_input_transfer_func_params.pipe_ctx = current_mpc_pipe; + block_sequence[*num_steps].params.set_input_transfer_func_params.plane_state = current_mpc_pipe->plane_state; + block_sequence[*num_steps].func = DPP_SET_INPUT_TRANSFER_FUNC; + (*num_steps)++; + }

- if (dc->hwss.program_gamut_remap && current_mpc_pipe->plane_state->update_flags.bits.gamut_remap_change) { - block_sequence[*num_steps].params.program_gamut_remap_params.pipe_ctx = current_mpc_pipe; - block_sequence[*num_steps].func = DPP_PROGRAM_GAMUT_REMAP; - (*num_steps)++; - } - if (current_mpc_pipe->plane_state->update_flags.bits.input_csc_change) { - block_sequence[*num_steps].params.setup_dpp_params.pipe_ctx = current_mpc_pipe; - block_sequence[*num_steps].func = DPP_SETUP_DPP; - (*num_steps)++; - } - if (current_mpc_pipe->plane_state->update_flags.bits.coeff_reduction_change) { - block_sequence[*num_steps].params.program_bias_and_scale_params.pipe_ctx = current_mpc_pipe; - block_sequence[*num_steps].func = DPP_PROGRAM_BIAS_AND_SCALE; - (*num_steps)++; + if (dc->hwss.program_gamut_remap && current_mpc_pipe->plane_state->update_flags.bits.gamut_remap_change) { + block_sequence[*num_steps].params.program_gamut_remap_params.pipe_ctx = current_mpc_pipe; + block_sequence[*num_steps].func = DPP_PROGRAM_GAMUT_REMAP; + (*num_steps)++; + } + if (current_mpc_pipe->plane_state->update_flags.bits.input_csc_change) { + block_sequence[*num_steps].params.setup_dpp_params.pipe_ctx = current_mpc_pipe; + block_sequence[*num_steps].func = DPP_SETUP_DPP; + (*num_steps)++; + } + if (current_mpc_pipe->plane_state->update_flags.bits.coeff_reduction_change) { + block_sequence[*num_steps].params.program_bias_and_scale_params.pipe_ctx = current_mpc_pipe; + block_sequence[*num_steps].func = DPP_PROGRAM_BIAS_AND_SCALE; + (*num_steps)++; + } } if (hws->funcs.set_output_transfer_func && current_mpc_pipe->stream->update_flags.bits.out_tf) { block_sequence[*num_steps].params.set_output_transfer_func_params.dc = dc; diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c index 2532ad410cb56..456e19e0d415c 100644 --- a/drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c @@ -2283,6 +2283,9 @@ void dcn20_post_unlock_program_front_end( } }

+ if (!hwseq) + return; + /* P-State support transitions: * Natural -> FPO: P-State disabled in prepare, force disallow anytime is safe * FPO -> Natural: Unforce anytime after FW disable is safe (P-State will assert naturally) @@ -2290,7 +2293,7 @@ void dcn20_post_unlock_program_front_end( * FPO -> Unsupported: P-State disabled in prepare, unforce disallow anytime is safe * FPO <-> SubVP: Force disallow is maintained on the FPO / SubVP pipes */ - if (hwseq && hwseq->funcs.update_force_pstate) + if (hwseq->funcs.update_force_pstate) dc->hwseq->funcs.update_force_pstate(dc, context);

/* Only program the MALL registers after all the main and phantom pipes @@ -2529,6 +2532,9 @@ bool dcn20_wait_for_blank_complete( { int counter;

+ if (!opp) + return false; + for (counter = 0; counter < 1000; counter++) { if (!opp->funcs->dpg_is_pending(opp)) break; diff --git a/drivers/gpu/drm/amd/display/dc/link/accessories/link_dp_cts.c b/drivers/gpu/drm/amd/display/dc/link/accessories/link_dp_cts.c index 555c1c484cfdd..df3781081da7a 100644 --- a/drivers/gpu/drm/amd/display/dc/link/accessories/link_dp_cts.c +++ b/drivers/gpu/drm/amd/display/dc/link/accessories/link_dp_cts.c @@ -804,8 +804,11 @@ bool dp_set_test_pattern( break; }

+ if (!pipe_ctx->stream) + return false; + if (pipe_ctx->stream_res.tg->funcs->lock_doublebuffer_enable) { - if (pipe_ctx->stream && should_use_dmub_lock(pipe_ctx->stream->link)) { + if (should_use_dmub_lock(pipe_ctx->stream->link)) { union dmub_hw_lock_flags hw_locks = { 0 }; struct dmub_hw_lock_inst_flags inst_flags = { 0 };

diff --git a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.c b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.c index b76737b7b9e41..3e47a6735912a 100644 --- a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.c +++ b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_dio.c @@ -74,7 +74,10 @@ void reset_dio_stream_encoder(struct pipe_ctx *pipe_ctx) struct link_encoder *link_enc = link_enc_cfg_get_link_enc(pipe_ctx->stream->link); struct stream_encoder *stream_enc = pipe_ctx->stream_res.stream_enc;

- if (stream_enc && stream_enc->funcs->disable_fifo) + if (!stream_enc) + return; + + if (stream_enc->funcs->disable_fifo) stream_enc->funcs->disable_fifo(stream_enc); if (stream_enc->funcs->set_input_mode) stream_enc->funcs->set_input_mode(stream_enc, 0); diff --git a/drivers/gpu/drm/amd/display/dc/resource/dce112/dce112_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dce112/dce112_resource.c index 88afb2a30eef5..162856c523e40 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dce112/dce112_resource.c +++ b/drivers/gpu/drm/amd/display/dc/resource/dce112/dce112_resource.c @@ -1067,7 +1067,10 @@ static void bw_calcs_data_update_from_pplib(struct dc *dc) struct dm_pp_clock_levels clks = {0}; int memory_type_multiplier = MEMORY_TYPE_MULTIPLIER_CZ;

- if (dc->bw_vbios && dc->bw_vbios->memory_type == bw_def_hbm) + if (!dc->bw_vbios) + return; + + if (dc->bw_vbios->memory_type == bw_def_hbm) memory_type_multiplier = MEMORY_TYPE_HBM;

/*do system clock TODO PPLIB: after PPLIB implement, diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c index 969658313fd65..a43ffa53890af 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c @@ -1651,6 +1651,9 @@ static void dcn32_enable_phantom_plane(struct dc *dc, else phantom_plane = dc_state_create_phantom_plane(dc, context, curr_pipe->plane_state);

+ if (!phantom_plane) + continue; + memcpy(&phantom_plane->address, &curr_pipe->plane_state->address, sizeof(phantom_plane->address)); memcpy(&phantom_plane->scaling_quality, &curr_pipe->plane_state->scaling_quality, sizeof(phantom_plane->scaling_quality)); diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c index d184105ce2b3e..47c8a9fbe7546 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c @@ -218,12 +218,12 @@ bool dcn32_is_center_timing(struct pipe_ctx *pipe) pipe->stream->timing.v_addressable != pipe->stream->src.height) { is_center_timing = true; } - }

- if (pipe->plane_state) { - if (pipe->stream->timing.v_addressable != pipe->plane_state->dst_rect.height && - pipe->stream->timing.v_addressable != pipe->plane_state->src_rect.height) { - is_center_timing = true; + if (pipe->plane_state) { + if (pipe->stream->timing.v_addressable != pipe->plane_state->dst_rect.height && + pipe->stream->timing.v_addressable != pipe->plane_state->src_rect.height) { + is_center_timing = true; + } } }