The AP4_CttsAtom class in Core/Ap4CttsAtom.cpp in Bento4 1.5.1.0 allows remote attackers to cause a denial of service (application crash), related to a memory allocation failure, as demonstrated by mp2aac.
cpe:2.3:a:axiosys:bento4:1.5.1.0:*:*:*:*:*:*:*
83B32974-D913-4DDB-844F-C58D55ECC17E
OR
cmd: `mp42hls $poc` 
poc can download [here](https://github.com/lvtao-sec/Pocs/raw/master/bento4-integer-overflow)
version: master head
vuln type: integer and buffer overflow

There is an integer overflow at `Source/C++/Core/Ap4CttsAtom.cpp:80` , which then causes an buffer overflow read bugs at `Source/C++/Core/Ap4CttsAtom.cpp:89`.
```
//buggy code integer overflow
//entry_count can be 0x8000000a when debug, then 0x8000000a*8=0x400000050
//however entry_count is an unsigned int, so the multify result will be 0x50
unsigned char* buffer = new unsigned char[entry_count*8];

//buggy code buffer overflow read, when it read buffer more than 0x50, a buffer overflow read exception will throw by asan.
    for (unsigned i=0; i<entry_count; i++) {
        m_Entries[i].m_SampleCount  = AP4_BytesToUInt32BE(&buffer[i*8  ]);
        AP4_UI32 offset             = AP4_BytesToUInt32BE(&buffer[i*8+4]);
        //if (offset & 0x80000000) {
        //    use_quicktime_format = true;
        //    AP4_SI32 noffset = (AP4_SI32)offset;
        //    if (noffset < quicktime_min_offset) quicktime_min_offset = noffset;
        //}
        m_Entries[i].m_SampleOffset = offset;
    }
```
The following is the debug process. 
Integer overflow:
```
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── source:/home/lt/vuln-f[...].cpp+80 ────
     75      m_LookupCache.entry_index = 0;
     76
     77      AP4_UI32 entry_count;
     78      stream.ReadUI32(entry_count);
     79      m_Entries.SetItemCount(entry_count);
             // buffer=0x00007fffffffc4e8  →  [...]  →  <AP4_StdcFileByteStream::~AP4_StdcFileByteStream()+0> push rbp
 →   80      unsigned char* buffer = new unsigned char[entry_count*8];
     81      AP4_Result result = stream.Read(buffer, entry_count*8);
     82      if (AP4_FAILED(result)) {
     83          delete[] buffer;
     84          return;
     85      }
─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── threads ────
[#0] Id 1, Name: "mp42hls", stopped, reason: BREAKPOINT
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── trace ────
[#0] 0x490fc8 → AP4_CttsAtom::AP4_CttsAtom(this=0x60700000dc30, size=0x60, version=0x0, flags=0x0, stream=@0x60400000dfd0)
[#1] 0x490c5a → AP4_CttsAtom::Create(size=0x60, stream=@0x60400000dfd0)
[#2] 0x48ccc3 → AP4_AtomFactory::CreateAtomFromStream(this=0x7fffffffe180, stream=@0x60400000dfd0, type=0x63747473, size_32=0x60, size_64=0x60, atom=@0x7fffffffc990)
[#3] 0x48b20f → AP4_AtomFactory::CreateAtomFromStream(this=0x7fffffffe180, stream=@0x60400000dfd0, bytes_available=@0x7fffffffc9d0, atom=@0x7fffffffc990)
[#4] 0x51319c → AP4_ContainerAtom::ReadChildren(this=0x60700000dd10, atom_factory=@0x7fffffffe180, stream=@0x60400000dfd0, size=0x1c2)
[#5] 0x512c51 → AP4_ContainerAtom::AP4_ContainerAtom(this=0x60700000dd10, type=0x7374626c, size=0x1ca, force_64=0x0, stream=@0x60400000dfd0, atom_factory=@0x7fffffffe180)
[#6] 0x5127de → AP4_ContainerAtom::Create(type=0x7374626c, size=0x1ca, is_full=0x0, force_64=0x0, stream=@0x60400000dfd0, atom_factory=@0x7fffffffe180)
[#7] 0x48e257 → AP4_AtomFactory::CreateAtomFromStream(this=0x7fffffffe180, stream=@0x60400000dfd0, type=0x7374626c, size_32=0x1ca, size_64=0x1ca, atom=@0x7fffffffcf40)
[#8] 0x48b20f → AP4_AtomFactory::CreateAtomFromStream(this=0x7fffffffe180, stream=@0x60400000dfd0, bytes_available=@0x7fffffffcf80, atom=@0x7fffffffcf40)
[#9] 0x51319c → AP4_ContainerAtom::ReadChildren(this=0x60700000de60, atom_factory=@0x7fffffffe180, stream=@0x60400000dfd0, size=0x202)
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
gef➤  p entry_count
$7 = 0x8000000a
gef➤  p entry_count * 8
$8 = 0x50
gef➤

```
Buffer overflow crash
```
==10519==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60700000dc10 at pc 0x000000460f40 bp 0x7fffffffc480 sp 0x7fffffffc470
READ of size 1 at 0x60700000dc10 thread T0
    #0 0x460f3f in AP4_BytesToUInt32BE(unsigned char const*) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4Utils.h:78
    #1 0x49108a in AP4_CttsAtom::AP4_CttsAtom(unsigned int, unsigned char, unsigned int, AP4_ByteStream&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4CttsAtom.cpp:89
    #2 0x490c59 in AP4_CttsAtom::Create(unsigned int, AP4_ByteStream&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4CttsAtom.cpp:52
    #3 0x48ccc2 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:470
    #4 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #5 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #6 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #7 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #8 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #9 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #10 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #11 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #12 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #13 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #14 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #15 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #16 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #17 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #18 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #19 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #20 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #21 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #22 0x530a80 in AP4_TrakAtom::AP4_TrakAtom(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4TrakAtom.cpp:165
    #23 0x48eea1 in AP4_TrakAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4TrakAtom.h:58
    #24 0x48c6bb in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:390
    #25 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #26 0x48aabd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:152
    #27 0x4c9031 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4File.cpp:105
    #28 0x4c8c96 in AP4_File::AP4_File(AP4_ByteStream&, bool) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4File.cpp:78
    #29 0x45eebd in main /home/lt/vuln-fuzz/program/Bento4/Source/C++/Apps/Mp42Hls/Mp42Hls.cpp:1846
    #30 0x7ffff652882f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #31 0x4549e8 in _start (/home/lt/vuln-fuzz/program/Bento4/asan-build/mp42hls+0x4549e8)

0x60700000dc10 is located 0 bytes to the right of 80-byte region [0x60700000dbc0,0x60700000dc10)
allocated by thread T0 here:
    #0 0x7ffff6f036b2 in operator new[](unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x996b2)
    #1 0x490fd8 in AP4_CttsAtom::AP4_CttsAtom(unsigned int, unsigned char, unsigned int, AP4_ByteStream&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4CttsAtom.cpp:80
    #2 0x490c59 in AP4_CttsAtom::Create(unsigned int, AP4_ByteStream&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4CttsAtom.cpp:52
    #3 0x48ccc2 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:470
    #4 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #5 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #6 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #7 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #8 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #9 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #10 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #11 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #12 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #13 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #14 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #15 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #16 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #17 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #18 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #19 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #20 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #21 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #22 0x530a80 in AP4_TrakAtom::AP4_TrakAtom(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4TrakAtom.cpp:165
    #23 0x48eea1 in AP4_TrakAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4TrakAtom.h:58
    #24 0x48c6bb in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:390
    #25 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #26 0x48aabd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:152
    #27 0x4c9031 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4File.cpp:105
    #28 0x4c8c96 in AP4_File::AP4_File(AP4_ByteStream&, bool) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4File.cpp:78
    #29 0x45eebd in main /home/lt/vuln-fuzz/program/Bento4/Source/C++/Apps/Mp42Hls/Mp42Hls.cpp:1846

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4Utils.h:78 AP4_BytesToUInt32BE(unsigned char const*)
Shadow bytes around the buggy address:
  0x0c0e7fff9b30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff9b40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff9b50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff9b60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff9b70: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
=>0x0c0e7fff9b80: 00 00[fa]fa fa fa 00 00 00 00 00 00 00 00 00 fa
  0x0c0e7fff9b90: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 fa fa
  0x0c0e7fff9ba0: fa fa 00 00 00 00 00 00 00 00 00 00 fa fa fa fa
  0x0c0e7fff9bb0: 00 00 00 00 00 00 00 00 00 00 fa fa fa fa 00 00
  0x0c0e7fff9bc0: 00 00 00 00 00 00 00 00 fa fa fa fa 00 00 00 00
  0x0c0e7fff9bd0: 00 00 00 00 00 00 fa fa fa fa 00 00 00 00 00 00
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 right 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
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
==10519==ABORTING
```
Integer overflow at Source/C++/Core/Ap4CttsAtom.cpp:80 and buffer overflow at Source/C++/Core/Ap4CttsAtom.cpp:89
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : Integer overflow at Source/C++/Core/Ap4CttsAtom.cpp:80 and buffer overflow at Source/C++/Core/Ap4CttsAtom.cpp:89
Issue date:

--- start body ---
cmd: `mp42hls $poc` 
poc can download [here](https://github.com/lvtao-sec/Pocs/raw/master/bento4-integer-overflow)
version: master head
vuln type: integer and buffer overflow

There is an integer overflow at `Source/C++/Core/Ap4CttsAtom.cpp:80` , which then causes an buffer overflow read bugs at `Source/C++/Core/Ap4CttsAtom.cpp:89`.
```
//buggy code integer overflow
//entry_count can be 0x8000000a when debug, then 0x8000000a*8=0x400000050
//however entry_count is an unsigned int, so the multify result will be 0x50
unsigned char* buffer = new unsigned char[entry_count*8];

//buggy code buffer overflow read, when it read buffer more than 0x50, a buffer overflow read exception will throw by asan.
    for (unsigned i=0; i<entry_count; i++) {
        m_Entries[i].m_SampleCount  = AP4_BytesToUInt32BE(&buffer[i*8  ]);
        AP4_UI32 offset             = AP4_BytesToUInt32BE(&buffer[i*8+4]);
        //if (offset & 0x80000000) {
        //    use_quicktime_format = true;
        //    AP4_SI32 noffset = (AP4_SI32)offset;
        //    if (noffset < quicktime_min_offset) quicktime_min_offset = noffset;
        //}
        m_Entries[i].m_SampleOffset = offset;
    }
```
The following is the debug process. 
Integer overflow:
```
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── source:/home/lt/vuln-f[...].cpp+80 ────
     75      m_LookupCache.entry_index = 0;
     76
     77      AP4_UI32 entry_count;
     78      stream.ReadUI32(entry_count);
     79      m_Entries.SetItemCount(entry_count);
             // buffer=0x00007fffffffc4e8  →  [...]  →  <AP4_StdcFileByteStream::~AP4_StdcFileByteStream()+0> push rbp
 →   80      unsigned char* buffer = new unsigned char[entry_count*8];
     81      AP4_Result result = stream.Read(buffer, entry_count*8);
     82      if (AP4_FAILED(result)) {
     83          delete[] buffer;
     84          return;
     85      }
─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── threads ────
[#0] Id 1, Name: "mp42hls", stopped, reason: BREAKPOINT
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── trace ────
[#0] 0x490fc8 → AP4_CttsAtom::AP4_CttsAtom(this=0x60700000dc30, size=0x60, version=0x0, flags=0x0, stream=@0x60400000dfd0)
[#1] 0x490c5a → AP4_CttsAtom::Create(size=0x60, stream=@0x60400000dfd0)
[#2] 0x48ccc3 → AP4_AtomFactory::CreateAtomFromStream(this=0x7fffffffe180, stream=@0x60400000dfd0, type=0x63747473, size_32=0x60, size_64=0x60, atom=@0x7fffffffc990)
[#3] 0x48b20f → AP4_AtomFactory::CreateAtomFromStream(this=0x7fffffffe180, stream=@0x60400000dfd0, bytes_available=@0x7fffffffc9d0, atom=@0x7fffffffc990)
[#4] 0x51319c → AP4_ContainerAtom::ReadChildren(this=0x60700000dd10, atom_factory=@0x7fffffffe180, stream=@0x60400000dfd0, size=0x1c2)
[#5] 0x512c51 → AP4_ContainerAtom::AP4_ContainerAtom(this=0x60700000dd10, type=0x7374626c, size=0x1ca, force_64=0x0, stream=@0x60400000dfd0, atom_factory=@0x7fffffffe180)
[#6] 0x5127de → AP4_ContainerAtom::Create(type=0x7374626c, size=0x1ca, is_full=0x0, force_64=0x0, stream=@0x60400000dfd0, atom_factory=@0x7fffffffe180)
[#7] 0x48e257 → AP4_AtomFactory::CreateAtomFromStream(this=0x7fffffffe180, stream=@0x60400000dfd0, type=0x7374626c, size_32=0x1ca, size_64=0x1ca, atom=@0x7fffffffcf40)
[#8] 0x48b20f → AP4_AtomFactory::CreateAtomFromStream(this=0x7fffffffe180, stream=@0x60400000dfd0, bytes_available=@0x7fffffffcf80, atom=@0x7fffffffcf40)
[#9] 0x51319c → AP4_ContainerAtom::ReadChildren(this=0x60700000de60, atom_factory=@0x7fffffffe180, stream=@0x60400000dfd0, size=0x202)
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
gef➤  p entry_count
$7 = 0x8000000a
gef➤  p entry_count * 8
$8 = 0x50
gef➤

```
Buffer overflow crash
```
==10519==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60700000dc10 at pc 0x000000460f40 bp 0x7fffffffc480 sp 0x7fffffffc470
READ of size 1 at 0x60700000dc10 thread T0
    #0 0x460f3f in AP4_BytesToUInt32BE(unsigned char const*) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4Utils.h:78
    #1 0x49108a in AP4_CttsAtom::AP4_CttsAtom(unsigned int, unsigned char, unsigned int, AP4_ByteStream&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4CttsAtom.cpp:89
    #2 0x490c59 in AP4_CttsAtom::Create(unsigned int, AP4_ByteStream&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4CttsAtom.cpp:52
    #3 0x48ccc2 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:470
    #4 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #5 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #6 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #7 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #8 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #9 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #10 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #11 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #12 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #13 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #14 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #15 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #16 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #17 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #18 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #19 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #20 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #21 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #22 0x530a80 in AP4_TrakAtom::AP4_TrakAtom(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4TrakAtom.cpp:165
    #23 0x48eea1 in AP4_TrakAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4TrakAtom.h:58
    #24 0x48c6bb in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:390
    #25 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #26 0x48aabd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:152
    #27 0x4c9031 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4File.cpp:105
    #28 0x4c8c96 in AP4_File::AP4_File(AP4_ByteStream&, bool) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4File.cpp:78
    #29 0x45eebd in main /home/lt/vuln-fuzz/program/Bento4/Source/C++/Apps/Mp42Hls/Mp42Hls.cpp:1846
    #30 0x7ffff652882f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #31 0x4549e8 in _start (/home/lt/vuln-fuzz/program/Bento4/asan-build/mp42hls+0x4549e8)

0x60700000dc10 is located 0 bytes to the right of 80-byte region [0x60700000dbc0,0x60700000dc10)
allocated by thread T0 here:
    #0 0x7ffff6f036b2 in operator new[](unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x996b2)
    #1 0x490fd8 in AP4_CttsAtom::AP4_CttsAtom(unsigned int, unsigned char, unsigned int, AP4_ByteStream&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4CttsAtom.cpp:80
    #2 0x490c59 in AP4_CttsAtom::Create(unsigned int, AP4_ByteStream&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4CttsAtom.cpp:52
    #3 0x48ccc2 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:470
    #4 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #5 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #6 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #7 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #8 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #9 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #10 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #11 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #12 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #13 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #14 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #15 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #16 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #17 0x5127dd in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:88
    #18 0x48e256 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:775
    #19 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #20 0x51319b in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #21 0x512c50 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #22 0x530a80 in AP4_TrakAtom::AP4_TrakAtom(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4TrakAtom.cpp:165
    #23 0x48eea1 in AP4_TrakAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4TrakAtom.h:58
    #24 0x48c6bb in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:390
    #25 0x48b20e in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:232
    #26 0x48aabd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4AtomFactory.cpp:152
    #27 0x4c9031 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4File.cpp:105
    #28 0x4c8c96 in AP4_File::AP4_File(AP4_ByteStream&, bool) /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4File.cpp:78
    #29 0x45eebd in main /home/lt/vuln-fuzz/program/Bento4/Source/C++/Apps/Mp42Hls/Mp42Hls.cpp:1846

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/lt/vuln-fuzz/program/Bento4/Source/C++/Core/Ap4Utils.h:78 AP4_BytesToUInt32BE(unsigned char const*)
Shadow bytes around the buggy address:
  0x0c0e7fff9b30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff9b40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff9b50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff9b60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff9b70: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
=>0x0c0e7fff9b80: 00 00[fa]fa fa fa 00 00 00 00 00 00 00 00 00 fa
  0x0c0e7fff9b90: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 fa fa
  0x0c0e7fff9ba0: fa fa 00 00 00 00 00 00 00 00 00 00 fa fa fa fa
  0x0c0e7fff9bb0: 00 00 00 00 00 00 00 00 00 00 fa fa fa fa 00 00
  0x0c0e7fff9bc0: 00 00 00 00 00 00 00 00 fa fa fa fa 00 00 00 00
  0x0c0e7fff9bd0: 00 00 00 00 00 00 fa fa fa fa 00 00 00 00 00 00
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 right 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
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
==10519==ABORTING
```
--- end body ---

comments :
--- start comments ---

--- end comments ---