tcpdump: Buffer over-read in print-telnet.c:telnet_parse() in telnet parser

The telnet parser in tcpdump before 4.9.2 has a buffer over-read in print-telnet.c:telnetparse...

UBUNTU-CVE-2017-12988

The telnet parser in tcpdump before 4.9.2 has a buffer over-read in print-telnet.c:telnetparse...