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drm/mst: Add range check for max_payloads during init
max_payload is limited by the space we have in drm_dp_mst_topology_mgr::vcpi_mask,payload_mask. We need to track max_payloads+1 IDs in these masks, see drm_dp_mst_assign_payload_id(). Add a sanity check for this. Caught by coverity. Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: David Weinehall <david.weinehall@intel.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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@ -2848,6 +2848,9 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
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mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
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mgr->max_payloads = max_payloads;
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mgr->conn_base_id = conn_base_id;
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if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
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max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
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return -EINVAL;
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mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
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if (!mgr->payloads)
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return -ENOMEM;
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