Hello,
A heap-buffer-overflow has occurred when running program mp42aac
System info：
Ubuntu 20.04.1 : clang 10.0.0 , gcc 9.3.0



Bento4 version 1.6.0-636

[poc.zip](https://github.com/axiomatic-systems/Bento4/files/6629448/poc.zip)


Verification steps：
1.Get the source code of Bento4
2.Compile 

```
cd Bento4
mkdir check_build && cd check_build
cmake ../ -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_FLAGS="fsanitize=address"
make -j 16
``` 
3.run mp42aac

```
./mp42aac poc /dev/null
```

asan info

```
==1646778==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000011f at pc 0x55f5c415a3e8 bp 0x7ffe4296a5c0 sp 0x7ffe4296a5b0
READ of size 1 at 0x60200000011f thread T0
    #0 0x55f5c415a3e7 in AP4_Dec3Atom::AP4_Dec3Atom(unsigned int, unsigned char const*) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4Dec3Atom.cpp:161
    #1 0x55f5c415a71f in AP4_Dec3Atom::Create(unsigned int, AP4_ByteStream&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4Dec3Atom.cpp:56
    #2 0x55f5c40d908b in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:769
    #3 0x55f5c40dec9c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:234
    #4 0x55f5c4133b43 in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #5 0x55f5c40549c3 in AP4_SampleEntry::Read(AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4SampleEntry.cpp:115
    #6 0x55f5c4061ad8 in AP4_AudioSampleEntry::AP4_AudioSampleEntry(unsigned int, unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4SampleEntry.cpp:420
    #7 0x55f5c4026e09 in AP4_EncaSampleEntry::AP4_EncaSampleEntry(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4Protection.cpp:74
    #8 0x55f5c40d9855 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:298
    #9 0x55f5c40dec9c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:234
    #10 0x55f5c406eef7 in AP4_StsdAtom::AP4_StsdAtom(unsigned int, unsigned char, unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4StsdAtom.cpp:101
    #11 0x55f5c406f966 in AP4_StsdAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4StsdAtom.cpp:57
    #12 0x55f5c40d9341 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:458
    #13 0x55f5c40dec9c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:234
    #14 0x55f5c40e0513 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:154
    #15 0x55f5c401403e in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4File.cpp:104
    #16 0x55f5c4014dda in AP4_File::AP4_File(AP4_ByteStream&, bool) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4File.cpp:78
    #17 0x55f5c4002ef4 in main /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Apps/Mp42Aac/Mp42Aac.cpp:250
    #18 0x7f59c140b0b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #19 0x55f5c400714d in _start (/home/dh/sda3/AFLplusplus/Bento4-master/mp42aac_afl+++0x5914d)

0x60200000011f is located 0 bytes to the right of 15-byte region [0x602000000110,0x60200000011f)
allocated by thread T0 here:
    #0 0x7f59c1a30b47 in operator new[](unsigned long) (/lib/x86_64-linux-gnu/libasan.so.5+0x10fb47)
    #1 0x55f5c4011611 in AP4_DataBuffer::AP4_DataBuffer(unsigned int) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4DataBuffer.cpp:55
    #2 0x7f59bde0ee00  (<unknown module>)

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4Dec3Atom.cpp:161 in AP4_Dec3Atom::AP4_Dec3Atom(unsigned int, unsigned char const*)
Shadow bytes around the buggy address:
  0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff8000: fa fa 00 00 fa fa 00 00 fa fa 00 00 fa fa 00 00
  0x0c047fff8010: fa fa 04 fa fa fa fd fa fa fa 01 fa fa fa 00 fa
=>0x0c047fff8020: fa fa 00[07]fa fa 00 07 fa fa fa fa fa fa fa fa
  0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8070: 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
==1646778==ABORTING

```











A heap-buffer-overflow has occurred when running program mp42aac
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : A heap-buffer-overflow has occurred when running program mp42aac
Issue date:

--- start body ---
Hello,
A heap-buffer-overflow has occurred when running program mp42aac
System info：
Ubuntu 20.04.1 : clang 10.0.0 , gcc 9.3.0



Bento4 version 1.6.0-636

[poc.zip](https://github.com/axiomatic-systems/Bento4/files/6629448/poc.zip)


Verification steps：
1.Get the source code of Bento4
2.Compile 

```
cd Bento4
mkdir check_build && cd check_build
cmake ../ -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_FLAGS="fsanitize=address"
make -j 16
``` 
3.run mp42aac

```
./mp42aac poc /dev/null
```

asan info

```
==1646778==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000011f at pc 0x55f5c415a3e8 bp 0x7ffe4296a5c0 sp 0x7ffe4296a5b0
READ of size 1 at 0x60200000011f thread T0
    #0 0x55f5c415a3e7 in AP4_Dec3Atom::AP4_Dec3Atom(unsigned int, unsigned char const*) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4Dec3Atom.cpp:161
    #1 0x55f5c415a71f in AP4_Dec3Atom::Create(unsigned int, AP4_ByteStream&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4Dec3Atom.cpp:56
    #2 0x55f5c40d908b in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:769
    #3 0x55f5c40dec9c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:234
    #4 0x55f5c4133b43 in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #5 0x55f5c40549c3 in AP4_SampleEntry::Read(AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4SampleEntry.cpp:115
    #6 0x55f5c4061ad8 in AP4_AudioSampleEntry::AP4_AudioSampleEntry(unsigned int, unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4SampleEntry.cpp:420
    #7 0x55f5c4026e09 in AP4_EncaSampleEntry::AP4_EncaSampleEntry(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4Protection.cpp:74
    #8 0x55f5c40d9855 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:298
    #9 0x55f5c40dec9c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:234
    #10 0x55f5c406eef7 in AP4_StsdAtom::AP4_StsdAtom(unsigned int, unsigned char, unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4StsdAtom.cpp:101
    #11 0x55f5c406f966 in AP4_StsdAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4StsdAtom.cpp:57
    #12 0x55f5c40d9341 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:458
    #13 0x55f5c40dec9c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:234
    #14 0x55f5c40e0513 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4AtomFactory.cpp:154
    #15 0x55f5c401403e in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4File.cpp:104
    #16 0x55f5c4014dda in AP4_File::AP4_File(AP4_ByteStream&, bool) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4File.cpp:78
    #17 0x55f5c4002ef4 in main /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Apps/Mp42Aac/Mp42Aac.cpp:250
    #18 0x7f59c140b0b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #19 0x55f5c400714d in _start (/home/dh/sda3/AFLplusplus/Bento4-master/mp42aac_afl+++0x5914d)

0x60200000011f is located 0 bytes to the right of 15-byte region [0x602000000110,0x60200000011f)
allocated by thread T0 here:
    #0 0x7f59c1a30b47 in operator new[](unsigned long) (/lib/x86_64-linux-gnu/libasan.so.5+0x10fb47)
    #1 0x55f5c4011611 in AP4_DataBuffer::AP4_DataBuffer(unsigned int) /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4DataBuffer.cpp:55
    #2 0x7f59bde0ee00  (<unknown module>)

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/dh/AFLplusplus/Bento4-master/Bento4-master-afl++/Source/C++/Core/Ap4Dec3Atom.cpp:161 in AP4_Dec3Atom::AP4_Dec3Atom(unsigned int, unsigned char const*)
Shadow bytes around the buggy address:
  0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff8000: fa fa 00 00 fa fa 00 00 fa fa 00 00 fa fa 00 00
  0x0c047fff8010: fa fa 04 fa fa fa fd fa fa fa 01 fa fa fa 00 fa
=>0x0c047fff8020: fa fa 00[07]fa fa 00 07 fa fa fa fa fa fa fa fa
  0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8070: 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
==1646778==ABORTING

```











--- end body ---
