[2019-08-02] - Found with Honggfuzz - CVE-2019-14541

Stack-based buffer overflow in the cb_encode_program_id() function, in
cobc/typeck.c.

Issue can be reproduced by running:

```
cobc test04.cob
```

```
=================================================================
==4485==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff6b7f3400 at pc 0x0000006440f3 bp 0x7fff6b7f32d0 sp 0x7fff6b7f32c8
WRITE of size 1 at 0x7fff6b7f3400 thread T0
    #0 0x6440f2 in cb_encode_program_id /home/fcambus/gnucobol/cobc/typeck.c:1573:9
    #1 0x644c3c in cb_build_program_id /home/fcambus/gnucobol/cobc/typeck.c:1614:6
    #2 0x5a5a06 in setup_program /home/fcambus/gnucobol/cobc/parser.y:1198:5
    #3 0x551c13 in yyparse /home/fcambus/gnucobol/cobc/parser.y:3286:6
    #4 0x51d901 in process_translate /home/fcambus/gnucobol/cobc/cobc.c:6937:8
    #5 0x5014d7 in process_file /home/fcambus/gnucobol/cobc/cobc.c:8037:19
    #6 0x4faaaf in main /home/fcambus/gnucobol/cobc/cobc.c:8219:12
    #7 0x7f2f7f8a6b6a in __libc_start_main /build/glibc-KRRWSm/glibc-2.29/csu/../csu/libc-start.c:308:16
    #8 0x41c539 in _start (/usr/local/bin/cobc+0x41c539)

Address 0x7fff6b7f3400 is located in stack of thread T0 at offset 288 in frame
    #0 0x643acf in cb_encode_program_id /home/fcambus/gnucobol/cobc/typeck.c:1549

  This frame has 1 object(s):
    [32, 288) 'buff' (line 1553) <== Memory access at offset 288 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /home/fcambus/gnucobol/cobc/typeck.c:1573:9 in cb_encode_program_id
Shadow bytes around the buggy address:
  0x10006d6f6630: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006d6f6640: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006d6f6650: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
  0x10006d6f6660: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006d6f6670: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10006d6f6680:[f3]f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
  0x10006d6f6690: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006d6f66a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006d6f66b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006d6f66c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006d6f66d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==4485==ABORTING
```