From: Jimmy Kizito Date: Sun, 12 Sep 2021 15:21:52 +0000 (-0400) Subject: drm/amd/display: Fix null pointer dereference for encoders X-Git-Tag: block-5.16-2021-11-13~77^2~13^2~11 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=60f39edd897ea134a4ddb789a6795681691c3183;p=linux-block.git drm/amd/display: Fix null pointer dereference for encoders [Why] Links which are dynamically assigned link encoders have their link encoder set to NULL. [How] Check that a pointer to a link_encoder object is non-NULL before using it. Reviewed-by: Aric Cyr Reviewed-by: Meenakshikumar Somasundaram Acked-by: Rodrigo Siqueira Signed-off-by: Jimmy Kizito Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 0fe0eb06eacc..6421c896f2a1 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -5705,7 +5705,7 @@ enum dc_status dp_set_fec_ready(struct dc_link *link, bool ready) link_enc->funcs->fec_set_ready(link_enc, true); link->fec_state = dc_link_fec_ready; } else { - link_enc->funcs->fec_set_ready(link->link_enc, false); + link_enc->funcs->fec_set_ready(link_enc, false); link->fec_state = dc_link_fec_not_ready; dm_error("dpcd write failed to set fec_ready"); } diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c index e1edbfa761f1..c5e2b4f138fd 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c @@ -1587,7 +1587,7 @@ void dcn10_power_down_on_boot(struct dc *dc) for (i = 0; i < dc->link_count; i++) { struct dc_link *link = dc->links[i]; - if (link->link_enc->funcs->is_dig_enabled && + if (link->link_enc && link->link_enc->funcs->is_dig_enabled && link->link_enc->funcs->is_dig_enabled(link->link_enc) && dc->hwss.power_down) { dc->hwss.power_down(dc);