A Pointer Dereference Vulnerability exists in GPAC 1.0.1 via the Media_IsSelfContained function, which could cause a Denial of Service. .
Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [Yes ] I looked for a similar issue and couldn't find any.
- [ Yes] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [ Yes] 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/

**Version:**
```
./MP4Box -version
MP4Box - GPAC version 1.1.0-DEV-rev1574-g8b22f0912-master
(c) 2000-2021 Telecom Paris distributed under LGPL v2.1+ - http://gpac.io

Please cite our work in your research:
 GPAC Filters: https://doi.org/10.1145/3339825.3394929
 GPAC: https://doi.org/10.1145/1291233.1291452

GPAC Configuration: 
Features: GPAC_CONFIG_LINUX GPAC_64_BITS GPAC_HAS_IPV6 GPAC_HAS_SSL GPAC_HAS_SOCK_UN GPAC_MINIMAL_ODF GPAC_HAS_QJS GPAC_HAS_JPEG GPAC_HAS_PNG GPAC_HAS_LINUX_DVB
```

**command:**
```
./bin/gcc/MP4Box -hint POC11
```
[POC11.zip](https://github.com/gpac/gpac/files/7772906/POC11.zip)

**Result**
```
Segmentation fault
```
**bt**

```
Program received signal SIGSEGV, Segmentation fault.
[----------------------------------registers-----------------------------------]
RAX: 0x5569555dfdc4 
RBX: 0x1 
RCX: 0x5555555e18c0 --> 0x3712 
RDX: 0x4015 
RSI: 0x1 
RDI: 0x5555555e2840 --> 0x146d646975 
RBP: 0x5555555e2840 --> 0x146d646975 
RSP: 0x7fffffff7f70 --> 0x5555555e0e14 --> 0x4017 
RIP: 0x7ffff79286ca (<Media_IsSelfContained+26>:	mov    rax,QWORD PTR [rax+0x30])
R8 : 0x5555555e18c0 --> 0x3712 
R9 : 0x7fffffff7f00 --> 0x2 
R10: 0x7ffff76d927a ("gf_isom_box_size")
R11: 0x7ffff76a0be0 --> 0x5555555e8770 --> 0x5555555e18d4 --> 0x640204c700000000 
R12: 0x14 
R13: 0x5555555e05c0 --> 0x73747363 ('csts')
R14: 0x5555555e8740 --> 0x636f3648 ('H6oc')
R15: 0x1
EFLAGS: 0x10202 (carry parity adjust zero sign trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]
   0x7ffff79286c3 <Media_IsSelfContained+19>:	push   rbx
   0x7ffff79286c4 <Media_IsSelfContained+20>:	mov    rax,QWORD PTR [rdi+0x40]
   0x7ffff79286c8 <Media_IsSelfContained+24>:	mov    ebx,esi
=> 0x7ffff79286ca <Media_IsSelfContained+26>:	mov    rax,QWORD PTR [rax+0x30]
   0x7ffff79286ce <Media_IsSelfContained+30>:	mov    r12,QWORD PTR [rax+0x48]
   0x7ffff79286d2 <Media_IsSelfContained+34>:	test   esi,esi
   0x7ffff79286d4 <Media_IsSelfContained+36>:	je     0x7ffff7928780 <Media_IsSelfContained+208>
   0x7ffff79286da <Media_IsSelfContained+42>:	test   r12,r12
[------------------------------------stack-------------------------------------]
0000| 0x7fffffff7f70 --> 0x5555555e0e14 --> 0x4017 
0008| 0x7fffffff7f78 --> 0x5555555e8740 --> 0x636f3648 ('H6oc')
0016| 0x7fffffff7f80 --> 0x14 
0024| 0x7fffffff7f88 --> 0x7ffff790ffcb (<shift_chunk_offsets.part.0+75>:	test   eax,eax)
0032| 0x7fffffff7f90 --> 0x5555555e2840 --> 0x146d646975 
0040| 0x7fffffff7f98 --> 0x5555555e05c0 --> 0x73747363 ('csts')
0048| 0x7fffffff7fa0 --> 0x0 
0056| 0x7fffffff7fa8 --> 0x7fffffff7ff0 --> 0x5555555e8740 --> 0x636f3648 ('H6oc')
[------------------------------------------------------------------------------]
Legend: code, data, rodata, value
Stopped reason: SIGSEGV
0x00007ffff79286ca in Media_IsSelfContained () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
gdb-peda$ bt
#0  0x00007ffff79286ca in Media_IsSelfContained () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#1  0x00007ffff790ffcb in shift_chunk_offsets.part () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#2  0x00007ffff79103a7 in inplace_shift_moov_meta_offsets () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#3  0x00007ffff7910e3c in inplace_shift_mdat () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#4  0x00007ffff7915009 in WriteToFile () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#5  0x00007ffff7906432 in gf_isom_write () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#6  0x00007ffff79064b8 in gf_isom_close () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#7  0x000055555557bd12 in mp4boxMain ()
#8  0x00007ffff74dc0b3 in __libc_start_main (main=0x55555556d420 <main>, argc=0x3, argv=0x7fffffffe388, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fffffffe378) at ../csu/libc-start.c:308
#9  0x000055555556d45e in _start ()
```

Untrusted pointer dereference in Media_IsSelfContained ()
This is a GitHub Issue
repo:gpac
owner:gpac
Title : Untrusted pointer dereference in Media_IsSelfContained ()
Issue date:

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

- [Yes ] I looked for a similar issue and couldn't find any.
- [ Yes] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [ Yes] 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/

**Version:**
```
./MP4Box -version
MP4Box - GPAC version 1.1.0-DEV-rev1574-g8b22f0912-master
(c) 2000-2021 Telecom Paris distributed under LGPL v2.1+ - http://gpac.io

Please cite our work in your research:
 GPAC Filters: https://doi.org/10.1145/3339825.3394929
 GPAC: https://doi.org/10.1145/1291233.1291452

GPAC Configuration: 
Features: GPAC_CONFIG_LINUX GPAC_64_BITS GPAC_HAS_IPV6 GPAC_HAS_SSL GPAC_HAS_SOCK_UN GPAC_MINIMAL_ODF GPAC_HAS_QJS GPAC_HAS_JPEG GPAC_HAS_PNG GPAC_HAS_LINUX_DVB
```

**command:**
```
./bin/gcc/MP4Box -hint POC11
```
[POC11.zip](https://github.com/gpac/gpac/files/7772906/POC11.zip)

**Result**
```
Segmentation fault
```
**bt**

```
Program received signal SIGSEGV, Segmentation fault.
[----------------------------------registers-----------------------------------]
RAX: 0x5569555dfdc4 
RBX: 0x1 
RCX: 0x5555555e18c0 --> 0x3712 
RDX: 0x4015 
RSI: 0x1 
RDI: 0x5555555e2840 --> 0x146d646975 
RBP: 0x5555555e2840 --> 0x146d646975 
RSP: 0x7fffffff7f70 --> 0x5555555e0e14 --> 0x4017 
RIP: 0x7ffff79286ca (<Media_IsSelfContained+26>:	mov    rax,QWORD PTR [rax+0x30])
R8 : 0x5555555e18c0 --> 0x3712 
R9 : 0x7fffffff7f00 --> 0x2 
R10: 0x7ffff76d927a ("gf_isom_box_size")
R11: 0x7ffff76a0be0 --> 0x5555555e8770 --> 0x5555555e18d4 --> 0x640204c700000000 
R12: 0x14 
R13: 0x5555555e05c0 --> 0x73747363 ('csts')
R14: 0x5555555e8740 --> 0x636f3648 ('H6oc')
R15: 0x1
EFLAGS: 0x10202 (carry parity adjust zero sign trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]
   0x7ffff79286c3 <Media_IsSelfContained+19>:	push   rbx
   0x7ffff79286c4 <Media_IsSelfContained+20>:	mov    rax,QWORD PTR [rdi+0x40]
   0x7ffff79286c8 <Media_IsSelfContained+24>:	mov    ebx,esi
=> 0x7ffff79286ca <Media_IsSelfContained+26>:	mov    rax,QWORD PTR [rax+0x30]
   0x7ffff79286ce <Media_IsSelfContained+30>:	mov    r12,QWORD PTR [rax+0x48]
   0x7ffff79286d2 <Media_IsSelfContained+34>:	test   esi,esi
   0x7ffff79286d4 <Media_IsSelfContained+36>:	je     0x7ffff7928780 <Media_IsSelfContained+208>
   0x7ffff79286da <Media_IsSelfContained+42>:	test   r12,r12
[------------------------------------stack-------------------------------------]
0000| 0x7fffffff7f70 --> 0x5555555e0e14 --> 0x4017 
0008| 0x7fffffff7f78 --> 0x5555555e8740 --> 0x636f3648 ('H6oc')
0016| 0x7fffffff7f80 --> 0x14 
0024| 0x7fffffff7f88 --> 0x7ffff790ffcb (<shift_chunk_offsets.part.0+75>:	test   eax,eax)
0032| 0x7fffffff7f90 --> 0x5555555e2840 --> 0x146d646975 
0040| 0x7fffffff7f98 --> 0x5555555e05c0 --> 0x73747363 ('csts')
0048| 0x7fffffff7fa0 --> 0x0 
0056| 0x7fffffff7fa8 --> 0x7fffffff7ff0 --> 0x5555555e8740 --> 0x636f3648 ('H6oc')
[------------------------------------------------------------------------------]
Legend: code, data, rodata, value
Stopped reason: SIGSEGV
0x00007ffff79286ca in Media_IsSelfContained () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
gdb-peda$ bt
#0  0x00007ffff79286ca in Media_IsSelfContained () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#1  0x00007ffff790ffcb in shift_chunk_offsets.part () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#2  0x00007ffff79103a7 in inplace_shift_moov_meta_offsets () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#3  0x00007ffff7910e3c in inplace_shift_mdat () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#4  0x00007ffff7915009 in WriteToFile () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#5  0x00007ffff7906432 in gf_isom_write () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#6  0x00007ffff79064b8 in gf_isom_close () from /home/zxq/CVE_testing/source/gpac/bin/gcc/libgpac.so.10
#7  0x000055555557bd12 in mp4boxMain ()
#8  0x00007ffff74dc0b3 in __libc_start_main (main=0x55555556d420 <main>, argc=0x3, argv=0x7fffffffe388, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fffffffe378) at ../csu/libc-start.c:308
#9  0x000055555556d45e in _start ()
```

--- end body ---
