dimC_Read in isomedia/box_code_3gpp.c in GPAC 0.8.0 has a stack-based buffer overflow.
Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

[ √] I looked for a similar issue and couldn't find any.
[ √] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
[ √] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95
Detailed guidelines: http://gpac.io/2013/07/16/how-to-file-a-bug-properly/

A crafted input will lead to crash in box_code_3gpp.c at gpac 0.8.0.

Triggered by
./MP4Box -diso POC -out /dev/null

Poc
[011-stack-dimC_Read1000](https://github.com/gutiniao/afltest/blob/master/011-stack-dimC_Read1000)

The ASAN information is as follows:

```
./MP4Box -diso 011-stack-dimC_Read1000 -out /dev/null 
=================================================================
==3045==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff6e0d88d0 at pc 0x564b9b2d69fb bp 0x7fff6e0d8480 sp 0x7fff6e0d8470
WRITE of size 1 at 0x7fff6e0d88d0 thread T0
    #0 0x564b9b2d69fa in dimC_Read isomedia/box_code_3gpp.c:1000
    #1 0x564b9ae5bb35 in gf_isom_box_read isomedia/box_funcs.c:1528
    #2 0x564b9ae5bb35 in gf_isom_box_parse_ex isomedia/box_funcs.c:208
    #3 0x564b9ae5c1e4 in gf_isom_parse_root_box isomedia/box_funcs.c:42
    #4 0x564b9ae72f44 in gf_isom_parse_movie_boxes isomedia/isom_intern.c:206
    #5 0x564b9ae75bca in gf_isom_open_file isomedia/isom_intern.c:615
    #6 0x564b9abbe852 in mp4boxMain /home/liuz/gpac-master/applications/mp4box/main.c:4767
    #7 0x7f4b5d817b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #8 0x564b9abafb19 in _start (/usr/local/gpac-asan3/bin/MP4Box+0x163b19)

Address 0x7fff6e0d88d0 is located in stack of thread T0 at offset 1056 in frame
    #0 0x564b9b2d641f in dimC_Read isomedia/box_code_3gpp.c:983

  This frame has 1 object(s):
    [32, 1056) 'str' <== Memory access at offset 1056 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow isomedia/box_code_3gpp.c:1000 in dimC_Read
Shadow bytes around the buggy address:
  0x10006dc130c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc130d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc130e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc130f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc13100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10006dc13110: 00 00 00 00 00 00 00 00 00 00[f3]f3 f3 f3 00 00
  0x10006dc13120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc13130: 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 00 00 00 00
  0x10006dc13140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc13150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc13160: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2
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
==3045==ABORTING
```

There is a stack-buffer-overflow in the dimC_Read function of box_code_3gpp.c:1000
This is a GitHub Issue
repo:gpac
owner:gpac
Title : There is a stack-buffer-overflow in the dimC_Read function of box_code_3gpp.c:1000
Issue date:

--- start body ---
Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

[ √] I looked for a similar issue and couldn't find any.
[ √] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
[ √] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95
Detailed guidelines: http://gpac.io/2013/07/16/how-to-file-a-bug-properly/

A crafted input will lead to crash in box_code_3gpp.c at gpac 0.8.0.

Triggered by
./MP4Box -diso POC -out /dev/null

Poc
[011-stack-dimC_Read1000](https://github.com/gutiniao/afltest/blob/master/011-stack-dimC_Read1000)

The ASAN information is as follows:

```
./MP4Box -diso 011-stack-dimC_Read1000 -out /dev/null 
=================================================================
==3045==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff6e0d88d0 at pc 0x564b9b2d69fb bp 0x7fff6e0d8480 sp 0x7fff6e0d8470
WRITE of size 1 at 0x7fff6e0d88d0 thread T0
    #0 0x564b9b2d69fa in dimC_Read isomedia/box_code_3gpp.c:1000
    #1 0x564b9ae5bb35 in gf_isom_box_read isomedia/box_funcs.c:1528
    #2 0x564b9ae5bb35 in gf_isom_box_parse_ex isomedia/box_funcs.c:208
    #3 0x564b9ae5c1e4 in gf_isom_parse_root_box isomedia/box_funcs.c:42
    #4 0x564b9ae72f44 in gf_isom_parse_movie_boxes isomedia/isom_intern.c:206
    #5 0x564b9ae75bca in gf_isom_open_file isomedia/isom_intern.c:615
    #6 0x564b9abbe852 in mp4boxMain /home/liuz/gpac-master/applications/mp4box/main.c:4767
    #7 0x7f4b5d817b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #8 0x564b9abafb19 in _start (/usr/local/gpac-asan3/bin/MP4Box+0x163b19)

Address 0x7fff6e0d88d0 is located in stack of thread T0 at offset 1056 in frame
    #0 0x564b9b2d641f in dimC_Read isomedia/box_code_3gpp.c:983

  This frame has 1 object(s):
    [32, 1056) 'str' <== Memory access at offset 1056 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow isomedia/box_code_3gpp.c:1000 in dimC_Read
Shadow bytes around the buggy address:
  0x10006dc130c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc130d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc130e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc130f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc13100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10006dc13110: 00 00 00 00 00 00 00 00 00 00[f3]f3 f3 f3 00 00
  0x10006dc13120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc13130: 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 00 00 00 00
  0x10006dc13140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc13150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10006dc13160: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2
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
==3045==ABORTING
```

--- end body ---
