Division by zero segfault for custom serial baud rates

[arneboe]

drivers-iodrivers_base/src/Driver.cpp

Lines 479 to 480 in 07ef979

	ss.custom_divisor = (ss.baud_base + (brate / 2)) / brate;
	int closestSpeed = ss.baud_base / ss.custom_divisor;

ss.custom_divisor becomes zero if ss.baud_base <= brate / 2.
In this case the driver segfaults due to the division by zero. At least on my machine ss.baud_base seems to be zero by default thus this code segfaults for all custom baud rates.

[doudou]

A quick googling seems to indicate that one should set a standard baudrate before doing this.

https://github.com/cbrake/linux-serial-test/blob/master/linux-serial-test.c#L490

Could you try if this helps ?