MAC CCA thr: Check if channel out of range (#2363)

Author: Jarkko Paso

source/MAC/IEEE802_15_4/mac_cca_threshold.c

@@ -74,6 +74,10 @@ int8_t mac_cca_thr_get_dbm(protocol_interface_rf_mac_setup_s *rf_ptr, uint8_t ch
     if (!rf_ptr->cca_threshold) {
         return CCA_FAILED_DBM;
     }
+    // If channel is unknown, use default threshold
+    if (channel > (rf_ptr->cca_threshold->number_of_channels - 1)) {
+        return rf_ptr->cca_threshold->default_dbm;
+    }
     return rf_ptr->cca_threshold->ch_thresholds[channel];
 }
 
@@ -118,6 +122,12 @@ static int8_t mac_cca_thr_channel_failed(protocol_interface_rf_mac_setup_s *rf_p
 
 int8_t mac_cca_threshold_update(protocol_interface_rf_mac_setup_s *rf_ptr, uint8_t channel, int8_t dbm)
 {
+    if (!rf_ptr->cca_threshold) {
+        return -1;
+    }
+    if (channel > (rf_ptr->cca_threshold->number_of_channels - 1)) {
+        return -1;
+    }
     if (dbm == CCA_FAILED_DBM) {
         if (mac_cca_thr_channel_failed(rf_ptr, channel)) {
             return -1;