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drm/amd/display: Guard against ddc_pin being NULL for AUX 

[Why]
In the case where we don't support DMUB aux but we have DPIA links
in the configuration we might try to message AUX using the legacy
path - where DDC pin is NULL. This causes a NULL pointer dereference.

[How]
Guard against NULL DDC pin, return a failure for aux engine acquire.

Reviewed-by: Michael Strauss <Michael.Strauss@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2022-06-09 13:30:42 -04:00 committed by Alex Deucher
parent 7c50a3e99a
commit bc19909f19
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
View File

@ -572,6 +572,11 @@ int dce_aux_transfer_raw(struct ddc_service *ddc,
memset(&aux_req, 0, sizeof(aux_req));
if (ddc_pin == NULL) {
*operation_result = AUX_RET_ERROR_ENGINE_ACQUIRE;
return -1;
}
aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
if (!acquire(aux_engine, ddc_pin)) {
*operation_result = AUX_RET_ERROR_ENGINE_ACQUIRE;