An issue was discovered in gpac 0.8.0. The gf_odf_del_ipmp_tool function in odf_code.c has a heap-based buffer over-read.
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/

in odf_code.c [line3295](https://github.com/gpac/gpac/blob/1310ba63e7b928e2ae7546f3c88a9b0f06a76e0d/src/odf/odf_code.c#L3295
) The check for size here may have some problems.It will cause a heap overflow.And it will resulting in gf_odf_del_ipmp_tool to free a invalid address.
Here is the asan's result:
```
[ODF] Error reading descriptor (tag 3 size 0): Invalid MPEG-4 Descriptor
=================================================================
==19708== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602c0000ff68 at pc 0x7f448e47044d bp 0x7ffd384c3670 sp 0x7ffd384c2e30
WRITE of size 16 at 0x602c0000ff68 thread T0
    #0 0x7f448e47044c (/usr/lib/x86_64-linux-gnu/libasan.so.0.0.0+0xe44c)
    #1 0x43efa1 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x43efa1)
    #2 0x56cd48 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x56cd48)
    #3 0x562335 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x562335)
    #4 0x56d4c7 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x56d4c7)
    #5 0x6d4b48 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x6d4b48)
    #6 0x51d2ab (/home/lcy/gpac-master/bin/gcc/MP4Box+0x51d2ab)
    #7 0x51d814 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x51d814)
    #8 0x524cb5 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x524cb5)
    #9 0x525b2e (/home/lcy/gpac-master/bin/gcc/MP4Box+0x525b2e)
    #10 0x41cb6b (/home/lcy/gpac-master/bin/gcc/MP4Box+0x41cb6b)
    #11 0x7f448d75bf44 (/lib/x86_64-linux-gnu/libc-2.19.so+0x21f44)
    #12 0x40f2fd (/home/lcy/gpac-master/bin/gcc/MP4Box+0x40f2fd)
0x602c0000ff68 is located 0 bytes to the right of 360-byte region [0x602c0000fe00,0x602c0000ff68)
allocated by thread T0 here:
    #0 0x7f448e47741a (/usr/lib/x86_64-linux-gnu/libasan.so.0.0.0+0x1541a)
    #1 0x56cb6d (/home/lcy/gpac-master/bin/gcc/MP4Box+0x56cb6d)
Shadow bytes around the buggy address:
  0x0c05ffff9f90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffff9fa0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffff9fb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffff9fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c05ffff9fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c05ffff9fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00[fa]fa fa
  0x0c05ffff9ff0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffffa000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffffa010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffffa020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffffa030: 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
  Heap righ redzone:     fb
  Freed Heap region:     fd
  Stack left redzone:    f1
  Stack mid redzone:     f2
  Stack right redzone:   f3
  Stack partial redzone: f4
  Stack after return:    f5
  Stack use after scope: f8
  Global redzone:        f9
  Global init order:     f6
  Poisoned by user:      f7
  ASan internal:         fe
==19708== ABORTING

```
in odf_code.c line3295 have a heap-buffer-overflow
This is a GitHub Issue
repo:gpac
owner:gpac
Title : in odf_code.c line3295 have a heap-buffer-overflow
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/

in odf_code.c [line3295](https://github.com/gpac/gpac/blob/1310ba63e7b928e2ae7546f3c88a9b0f06a76e0d/src/odf/odf_code.c#L3295
) The check for size here may have some problems.It will cause a heap overflow.And it will resulting in gf_odf_del_ipmp_tool to free a invalid address.
Here is the asan's result:
```
[ODF] Error reading descriptor (tag 3 size 0): Invalid MPEG-4 Descriptor
=================================================================
==19708== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602c0000ff68 at pc 0x7f448e47044d bp 0x7ffd384c3670 sp 0x7ffd384c2e30
WRITE of size 16 at 0x602c0000ff68 thread T0
    #0 0x7f448e47044c (/usr/lib/x86_64-linux-gnu/libasan.so.0.0.0+0xe44c)
    #1 0x43efa1 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x43efa1)
    #2 0x56cd48 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x56cd48)
    #3 0x562335 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x562335)
    #4 0x56d4c7 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x56d4c7)
    #5 0x6d4b48 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x6d4b48)
    #6 0x51d2ab (/home/lcy/gpac-master/bin/gcc/MP4Box+0x51d2ab)
    #7 0x51d814 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x51d814)
    #8 0x524cb5 (/home/lcy/gpac-master/bin/gcc/MP4Box+0x524cb5)
    #9 0x525b2e (/home/lcy/gpac-master/bin/gcc/MP4Box+0x525b2e)
    #10 0x41cb6b (/home/lcy/gpac-master/bin/gcc/MP4Box+0x41cb6b)
    #11 0x7f448d75bf44 (/lib/x86_64-linux-gnu/libc-2.19.so+0x21f44)
    #12 0x40f2fd (/home/lcy/gpac-master/bin/gcc/MP4Box+0x40f2fd)
0x602c0000ff68 is located 0 bytes to the right of 360-byte region [0x602c0000fe00,0x602c0000ff68)
allocated by thread T0 here:
    #0 0x7f448e47741a (/usr/lib/x86_64-linux-gnu/libasan.so.0.0.0+0x1541a)
    #1 0x56cb6d (/home/lcy/gpac-master/bin/gcc/MP4Box+0x56cb6d)
Shadow bytes around the buggy address:
  0x0c05ffff9f90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffff9fa0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffff9fb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffff9fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c05ffff9fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c05ffff9fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00[fa]fa fa
  0x0c05ffff9ff0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffffa000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffffa010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffffa020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c05ffffa030: 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
  Heap righ redzone:     fb
  Freed Heap region:     fd
  Stack left redzone:    f1
  Stack mid redzone:     f2
  Stack right redzone:   f3
  Stack partial redzone: f4
  Stack after return:    f5
  Stack use after scope: f8
  Global redzone:        f9
  Global init order:     f6
  Poisoned by user:      f7
  ASan internal:         fe
==19708== ABORTING

```
--- end body ---

A heap buffer overflow vulnerability exists in the `odf_code.c` file of GPAC at line 3295. This vulnerability can lead to memory corruption and potentially allow an attacker to execute arbitrary code or crash the application. The issue arises from improper size checks that can cause the program to write beyond allocated memory, as indicated by AddressSanitizer's output.