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drm/amd/display: enable_hpo_dp_link_output: Check link_res->hpo_dp_link_enc before using it

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commit d925c04d97 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: 0beca868cd ("drm/amd/display: Check link_res->hpo_dp_link_enc before using it")
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Hung 2024-06-27 16:45:39 -06:00 committed by Greg Kroah-Hartman
parent e34ddcce00
commit df8d896f8f
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
View File

@ -110,6 +110,11 @@ void enable_hpo_dp_link_output(struct dc_link *link,
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,