R#44710 - SNMP: snmpwalk does not work if sysObjectID is not present

Fixed snmpwalk error if sysObjectID is not present or
system interface in snmpd config not present

Change-Id: I42dad87b6f1fde6efb4a096fbe9960f7b459b65c

net/net-snmp/src/system_mib.c

@@ -179,11 +179,17 @@ int handle_sysObjectID(netsnmp_mib_handler *handler,
 	char sys_ObjectID_str[MAX_STR_SIZE];
 	oid sys_ObjectID_oid[MAX_OID_LEN];
 	size_t sys_ObjectID_oid_len = MAX_OID_LEN;
+	int param_status = -1;
 
 	switch (reqinfo->mode) {
 	case MODE_GET:
 		/* call uci to get sysObjectID value from configuration file */
-		get_uci_str_params("snmpd", "system", "sysObjectID", sys_ObjectID_str, sizeof(sys_ObjectID_str));
+		param_status = get_uci_str_params("snmpd", "system", "sysObjectID", sys_ObjectID_str, sizeof(sys_ObjectID_str));
+
+		/* Handle the case when sysObjectID is not present or system interface is not present */
+		if (param_status == -1) {
+			return SNMP_ERR_NOERROR;
+		}
 
 		/* parse the string representation of the object ID */
 		if (snmp_parse_oid(sys_ObjectID_str, sys_ObjectID_oid, &sys_ObjectID_oid_len) == NULL) {