[2019-08-06] - Found with American Fuzzy Lop - CVE-2019-14690

Heap-based buffer overflow in CxadbmfPlayer::__bmf_convert_stream(),
in src/bmf.cpp.

```
=================================================================
==6298==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x63000000f8dd at pc 0x0000004c6aaf bp 0x7ffd579ffc90 sp 0x7ffd579ff440
WRITE of size 6 at 0x63000000f8dd thread T0
    #0 0x4c6aae in __asan_memset (/home/fcambus/reps/adplay+0x4c6aae)
    #1 0x7face9bf1bdd in CxadbmfPlayer::__bmf_convert_stream(unsigned char*, int) /home/fcambus/adplug/src/bmf.cpp:430:5
    #2 0x7face9bf1a0a in CxadbmfPlayer::xadplayer_load() /home/fcambus/adplug/src/bmf.cpp:189:12
    #3 0x7face9d5d88a in CxadPlayer::load(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, CFileProvider const&) /home/fcambus/adplug/src/xad.cpp:93:8
    #4 0x7face9bdf1d5 in CAdPlug::factory(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Copl*, CPlayers const&, CFileProvider const&) /home/fcambus/adplug/src/adplug.cpp:169:10
    #5 0x4fcd62 in play(char const*, Player*, int) /home/fcambus/adplay-unix/src/adplay.cc:309:11
    #6 0x4fbaf4 in main /home/fcambus/adplay-unix/src/adplay.cc:544:5
    #7 0x7face941d09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
    #8 0x41f759 in _start (/home/fcambus/reps/adplay+0x41f759)

0x63000000f8dd is located 6061 bytes to the right of 56624-byte region [0x630000000400,0x63000000e130)
allocated by thread T0 here:
    #0 0x4f67e2 in operator new(unsigned long) (/home/fcambus/reps/adplay+0x4f67e2)
    #1 0x7face9bf0157 in CxadbmfPlayer::factory(Copl*) /home/fcambus/adplug/src/bmf.cpp:78:10
    #2 0x7face9bdf11d in CAdPlug::factory(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Copl*, CPlayers const&, CFileProvider const&) /home/fcambus/adplug/src/adplug.cpp:168:10
    #3 0x4fcd62 in play(char const*, Player*, int) /home/fcambus/adplay-unix/src/adplay.cc:309:11
    #4 0x4fbaf4 in main /home/fcambus/adplay-unix/src/adplay.cc:544:5
    #5 0x7face941d09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)

SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/fcambus/reps/adplay+0x4c6aae) in __asan_memset
Shadow bytes around the buggy address:
  0x0c607fff9ec0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c607fff9ed0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c607fff9ee0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c607fff9ef0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c607fff9f00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c607fff9f10: fa fa fa fa fa fa fa fa fa fa fa[fa]fa fa fa fa
  0x0c607fff9f20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c607fff9f30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c607fff9f40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c607fff9f50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c607fff9f60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
==6298==ABORTING
```