Skip invalid MAC CCCH messages for being processed at UE

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

@@ -1827,6 +1827,12 @@ void nr_ue_process_mac_pdu(nr_downlink_indication_t *dl_info,
                 mac_subheader_len = 2;
               }
 
+              // Check if it is a valid CCCH message, we get all 00's messages very often
+              if ( pdu_len != (mac_subheader_len+mac_sdu_len) ) {
+                LOG_D(NR_MAC, "%s() Invalid CCCH message!, pdu_len: %d\n", __func__, pdu_len);
+                return;
+              }
+
               if ( mac_sdu_len > 0 ) {
 
                 LOG_D(NR_MAC,"DL_SCH_LCID_CCCH with payload len %d: bits\n", mac_sdu_len);