Test case "Set CAN FD bus params with field data.tseg2 set to invalid value" failed

[mac-can]

Findings:
Function KvaserCAN_SetBusParamsFd accepts invalid value 17 in field data.tseg2 of parameter params (KvaserUSB_BusParamsFd_t).

Remarks:
According to CAN FD specification the valid range for data phase parameter tseg2 shall be 1 to 16.

Affected:

• Leaf Pro HS v2
• Hybrid Pro 2x CAN/LIN

Rootcause:
The function itself does not check the range of the data field in the structure KvaserUSB_BusParamsFd_t The affected devices (and only the affected devices) do not response with an error when given an invalid value in field data.tseg2.

Comment:
This behavior on driver level is assessed as a minor issue, because sanity checks for CAN FD bit-rate settings are implemented on user level (CAN API V3).

Testcase:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TC19: Set CAN FD bus params with field 'data.tseg2' set to invalid value
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
expected: Not CANUSB_SUCCESS

note: this test requires a CAN FD capable device

pre:
- initialize DUT1 with configured settings

test: loop over selected invalid bus params
- sub(1): 1Mbps : 8Mbps with field 'data.tseg2' set to 255
- sub(2): 500kbps : 4Mbps with field 'data.tseg2' set to 17
- sub(3): 250kbps : 2Mbps with field 'data.tseg2' set to 255
- sub(4): 125kbps : 1Mbps with field 'data.tseg2' set to 17
-- try to set invalid bus params into DUT1
-- if nevertheless successful get bus params from DUT1
-- and compare set and get bus params

post:
- shutdown DUT1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Note: Value 255 is recognized as invalid by the affected devices and the corresponding sub-testcase passed.