asm Segmentation Faults 2017-06-02

Hello, I was using American Fuzzy Lop (afl-fuzz) to fuzz input to the `asm` program on Linux. Is fixing the crashes from these input files something you're interested in? The input files can be found here: https://github.com/rwhitworth/Core-War-fuzz/tree/master/2017-06-02

The files can be executed as `./asm id_filename.s` to cause seg faults. The version tested was git commit fb76aa4

Example gdb backtrace results can be found in the README.md from the dated directory.

Let me know if I can provide any more information to help narrow down this issue.