6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alex Hung <alex.hung@xxxxxxx>
commit d925c04d974c657d10471c0c2dba3bc9c7d994ee upstream.
[WHAT & HOW]
Functions dp_enable_link_phy and dp_disable_link_phy can pass link_res
without initializing hpo_dp_link_enc and it is necessary to check for
null before dereferencing.
This fixes 1 FORWARD_NULL issue reported by Coverity.
Fixes: 0beca868cde8 ("drm/amd/display: Check link_res->hpo_dp_link_enc before using it")
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
@@ -110,6 +110,11 @@ void enable_hpo_dp_link_output(struct dc
enum clock_source_id clock_source,
const struct dc_link_settings *link_settings)
{
+ if (!link_res->hpo_dp_link_enc) {
+ DC_LOG_ERROR("%s: invalid hpo_dp_link_enc\n", __func__);
+ return;
+ }
+
if (link->dc->res_pool->dccg->funcs->set_symclk32_le_root_clock_gating)
link->dc->res_pool->dccg->funcs->set_symclk32_le_root_clock_gating(
link->dc->res_pool->dccg,
