An issue was discovered in gpac 0.8.0. An invalid memory dereference exists in the function FixTrackID located in isom_intern.c, which allows attackers to cause a denial of service (DoS) via a crafted input.
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 isom_intern.c at gpac 0.8.0.

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

Poc
[009-invalid-FixTrackID](https://github.com/gutiniao/afltest/blob/master/009-invalid-FixTrackID)

The ASAN information is as follows:

```
./MP4Box -diso 009-invalid-FixTrackID -out /dev/null 
[iso file] Box "avcC" (start 939) has 34 extra bytes
[iso file] Unknown box type 0000 in parent sinf
[iso file] Unknown box type 74E8036B in parent moov
[iso file] Unknown box type tfhd in parent moof
[iso file] Box "UNKN" is larger than container box
[iso file] Box "moof" size 1463 (start 2004) invalid (read 7972)
ASAN:DEADLYSIGNAL
=================================================================
==13653==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000028 (pc 0x564b3322e701 bp 0x60d000000110 sp 0x7fff462fc3f0 T0)
==13653==The signal is caused by a READ memory access.
==13653==Hint: address points to the zero page.
    #0 0x564b3322e700 in FixTrackID isomedia/isom_intern.c:133
    #1 0x564b3322e700 in gf_isom_parse_movie_boxes isomedia/isom_intern.c:372
    #2 0x564b3322fbca in gf_isom_open_file isomedia/isom_intern.c:615
    #3 0x564b32f78852 in mp4boxMain /home/liuz/gpac-master/applications/mp4box/main.c:4767
    #4 0x7fd75e925b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #5 0x564b32f69b19 in _start (/usr/local/gpac-asan3/bin/MP4Box+0x163b19)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV isomedia/isom_intern.c:133 in FixTrackID
==13653==ABORTING
```
 Segmentation fault (ASAN: SEGV on unknown address) in the FixTrackID function of isom_intern.c:133
This is a GitHub Issue
repo:gpac
owner:gpac
Title :  Segmentation fault (ASAN: SEGV on unknown address) in the FixTrackID function of isom_intern.c:133
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 isom_intern.c at gpac 0.8.0.

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

Poc
[009-invalid-FixTrackID](https://github.com/gutiniao/afltest/blob/master/009-invalid-FixTrackID)

The ASAN information is as follows:

```
./MP4Box -diso 009-invalid-FixTrackID -out /dev/null 
[iso file] Box "avcC" (start 939) has 34 extra bytes
[iso file] Unknown box type 0000 in parent sinf
[iso file] Unknown box type 74E8036B in parent moov
[iso file] Unknown box type tfhd in parent moof
[iso file] Box "UNKN" is larger than container box
[iso file] Box "moof" size 1463 (start 2004) invalid (read 7972)
ASAN:DEADLYSIGNAL
=================================================================
==13653==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000028 (pc 0x564b3322e701 bp 0x60d000000110 sp 0x7fff462fc3f0 T0)
==13653==The signal is caused by a READ memory access.
==13653==Hint: address points to the zero page.
    #0 0x564b3322e700 in FixTrackID isomedia/isom_intern.c:133
    #1 0x564b3322e700 in gf_isom_parse_movie_boxes isomedia/isom_intern.c:372
    #2 0x564b3322fbca in gf_isom_open_file isomedia/isom_intern.c:615
    #3 0x564b32f78852 in mp4boxMain /home/liuz/gpac-master/applications/mp4box/main.c:4767
    #4 0x7fd75e925b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #5 0x564b32f69b19 in _start (/usr/local/gpac-asan3/bin/MP4Box+0x163b19)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV isomedia/isom_intern.c:133 in FixTrackID
==13653==ABORTING
```
--- end body ---
