Marian Buschsieweke authored Aug 03, 2017 and Natanael Copa committed Aug 03, 2017

microcom does not check if required parameter "TTY" is present. Thus,
bb_basename() is called with a NULL pointer, if microcom is started without
any parameter. This in turn calls strlen() on this NULL pointer, resulting
in a segfault. The supplied patch adds a check for the missing TTY parameter
and prints usage when it is missing.