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drm/amd/display: add null check

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[WHY]
Prevents null pointer dereferences to enhance function robustness

[HOW]
Adds early null check and return false if invalid.

Reviewed-by: Cruise Hung <cruise.hung@amd.com>
Signed-off-by: Peichen Huang <PeiChen.Huang@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Peichen Huang 2025-06-12 16:06:41 +08:00 committed by Alex Deucher
parent 38b20968f3
commit 158b9201c1
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -6398,11 +6398,13 @@ unsigned int dc_get_det_buffer_size_from_state(const struct dc_state *context)
*/
bool dc_get_host_router_index(const struct dc_link *link, unsigned int *host_router_index)
{
struct dc *dc = link->ctx->dc;
struct dc *dc;
if (link->ep_type != DISPLAY_ENDPOINT_USB4_DPIA)
if (!link || !host_router_index || link->ep_type != DISPLAY_ENDPOINT_USB4_DPIA)
return false;
dc = link->ctx->dc;
if (link->link_index < dc->lowest_dpia_link_index)
return false;