An issue was discovered in Bento4 through 1.6.0-639. A NULL pointer dereference occurs in AP4_File::ParseStream in Core/Ap4File.cpp, which is called from AP4_File::AP4_File.
Hello, I use my fuzzer to fuzz binary mp4tag and binary mp42hevc , and found some crashes.  The bug1 is different from issue #295, because i run the test-001.mp4 finding it useless. Here are the details.
# Bug1
```
┌──(kali㉿kali)-[~/Desktop/Bento4/cmakebuild]
└─$ ./mp4tag mp4tag_poc                                                                
ERROR: cannot open input file

=================================================================
==2376684==ERROR: LeakSanitizer: detected memory leaks
                                                                                                                                                       
Direct leak of 40 byte(s) in 1 object(s) allocated from:
    #0 0x4c93dd in operator new(unsigned long) (/home/kali/Desktop/Bento4/cmakebuild/mp4tag+0x4c93dd)                                                  
    #1 0x4ccf5e in ParseCommandLine(int, char**) /home/kali/Desktop/Bento4/Source/C++/Apps/Mp4Tag/Mp4Tag.cpp:207:34
    #2 0x4ccf5e in main /home/kali/Desktop/Bento4/Source/C++/Apps/Mp4Tag/Mp4Tag.cpp:783:5
    #3 0x7f1b3ea14209 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

SUMMARY: AddressSanitizer: 40 byte(s) leaked in 1 allocation(s).

```
# Bug2
```
┌──(kali㉿kali)-[~/Desktop/Bento4/cmakebuild]
└─$ ./mp42hevc mp42hevc_poc /dev/null                                                                                                              1 ⨯
ERROR: cannot open input (-5)
AddressSanitizer:DEADLYSIGNAL
=================================================================
==2392528==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000004d52c3 bp 0x7fff8ac3ad90 sp 0x7fff8ac3ac40 T0)
==2392528==The signal is caused by a READ memory access.                                                                                               
==2392528==Hint: address points to the zero page.
    #0 0x4d52c3 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /home/kali/Desktop/Bento4/Source/C++/Core/Ap4File.cpp:103:12
    #1 0x4d5aea in AP4_File::AP4_File(AP4_ByteStream&, bool) /home/kali/Desktop/Bento4/Source/C++/Core/Ap4File.cpp:78:5
    #2 0x4cbea4 in main /home/kali/Desktop/Bento4/Source/C++/Apps/Mp42Hevc/Mp42Hevc.cpp:374:32
    #3 0x7fd8587a8209 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #4 0x7fd8587a82bb in __libc_start_main csu/../csu/libc-start.c:389:3
    #5 0x41f600 in _start (/home/kali/Desktop/Bento4/cmakebuild/mp42hevc+0x41f600)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/kali/Desktop/Bento4/Source/C++/Core/Ap4File.cpp:103:12 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool)
==2392528==ABORTING

```

# Environment
```
clang 11.0.1
clang++ 11.0.1
version:master branch(commit[5b7cc25](https://github.com/axiomatic-systems/Bento4/commit/5b7cc2500d514717a64675fcf631939494c074ce))+Bento4-1.6.0-639
```
# Platform
```
└─$ uname -a                                                                                                                                       1 ⨯
Linux kali 5.10.0-kali9-amd64 #1 SMP Debian 5.10.46-4kali1 (2021-08-09) x86_64 GNU/Linux

```
# How to reproduce
```
export CC=clang
export CXX=clang++
export CFLAGS="-fsanitize=address -g"
export CXXFLAGS="-fsanitize=address -g"
mkdir cmakebuild
cd cmakebuild
cmake -DCMAKE_BUILD_TYPE=Release ..
make
```
# Note
```
I find the two bugs not only exist in latest branch but also exist in latest release version Bento4-1.6.0-639.
```
# POC
[poc_Bento4.zip](https://github.com/axiomatic-systems/Bento4/files/9653209/poc_Bento4.zip)

# Credit

Yuhang Huang ([NCNIPC of China](http://www.nipc.org.cn/)),(Zhongguancun Laboratory)
Han Zheng ([NCNIPC of China](http://www.nipc.org.cn/), [Hexhive](http://hexhive.epfl.ch/)),(Zhongguancun Laboratory)
Wanying Cao, Mengyue Feng([NCNIPC of China](http://www.nipc.org.cn/)),(Zhongguancun Laboratory)

Thansk for your time!
There are some vulnerabilities in Bento4
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : There are some vulnerabilities in Bento4
Issue date:

--- start body ---
Hello, I use my fuzzer to fuzz binary mp4tag and binary mp42hevc , and found some crashes.  The bug1 is different from issue #295, because i run the test-001.mp4 finding it useless. Here are the details.
# Bug1
```
┌──(kali㉿kali)-[~/Desktop/Bento4/cmakebuild]
└─$ ./mp4tag mp4tag_poc                                                                
ERROR: cannot open input file

=================================================================
==2376684==ERROR: LeakSanitizer: detected memory leaks
                                                                                                                                                       
Direct leak of 40 byte(s) in 1 object(s) allocated from:
    #0 0x4c93dd in operator new(unsigned long) (/home/kali/Desktop/Bento4/cmakebuild/mp4tag+0x4c93dd)                                                  
    #1 0x4ccf5e in ParseCommandLine(int, char**) /home/kali/Desktop/Bento4/Source/C++/Apps/Mp4Tag/Mp4Tag.cpp:207:34
    #2 0x4ccf5e in main /home/kali/Desktop/Bento4/Source/C++/Apps/Mp4Tag/Mp4Tag.cpp:783:5
    #3 0x7f1b3ea14209 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

SUMMARY: AddressSanitizer: 40 byte(s) leaked in 1 allocation(s).

```
# Bug2
```
┌──(kali㉿kali)-[~/Desktop/Bento4/cmakebuild]
└─$ ./mp42hevc mp42hevc_poc /dev/null                                                                                                              1 ⨯
ERROR: cannot open input (-5)
AddressSanitizer:DEADLYSIGNAL
=================================================================
==2392528==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000004d52c3 bp 0x7fff8ac3ad90 sp 0x7fff8ac3ac40 T0)
==2392528==The signal is caused by a READ memory access.                                                                                               
==2392528==Hint: address points to the zero page.
    #0 0x4d52c3 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /home/kali/Desktop/Bento4/Source/C++/Core/Ap4File.cpp:103:12
    #1 0x4d5aea in AP4_File::AP4_File(AP4_ByteStream&, bool) /home/kali/Desktop/Bento4/Source/C++/Core/Ap4File.cpp:78:5
    #2 0x4cbea4 in main /home/kali/Desktop/Bento4/Source/C++/Apps/Mp42Hevc/Mp42Hevc.cpp:374:32
    #3 0x7fd8587a8209 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #4 0x7fd8587a82bb in __libc_start_main csu/../csu/libc-start.c:389:3
    #5 0x41f600 in _start (/home/kali/Desktop/Bento4/cmakebuild/mp42hevc+0x41f600)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/kali/Desktop/Bento4/Source/C++/Core/Ap4File.cpp:103:12 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool)
==2392528==ABORTING

```

# Environment
```
clang 11.0.1
clang++ 11.0.1
version:master branch(commit[5b7cc25](https://github.com/axiomatic-systems/Bento4/commit/5b7cc2500d514717a64675fcf631939494c074ce))+Bento4-1.6.0-639
```
# Platform
```
└─$ uname -a                                                                                                                                       1 ⨯
Linux kali 5.10.0-kali9-amd64 #1 SMP Debian 5.10.46-4kali1 (2021-08-09) x86_64 GNU/Linux

```
# How to reproduce
```
export CC=clang
export CXX=clang++
export CFLAGS="-fsanitize=address -g"
export CXXFLAGS="-fsanitize=address -g"
mkdir cmakebuild
cd cmakebuild
cmake -DCMAKE_BUILD_TYPE=Release ..
make
```
# Note
```
I find the two bugs not only exist in latest branch but also exist in latest release version Bento4-1.6.0-639.
```
# POC
[poc_Bento4.zip](https://github.com/axiomatic-systems/Bento4/files/9653209/poc_Bento4.zip)

# Credit

Yuhang Huang ([NCNIPC of China](http://www.nipc.org.cn/)),(Zhongguancun Laboratory)
Han Zheng ([NCNIPC of China](http://www.nipc.org.cn/), [Hexhive](http://hexhive.epfl.ch/)),(Zhongguancun Laboratory)
Wanying Cao, Mengyue Feng([NCNIPC of China](http://www.nipc.org.cn/)),(Zhongguancun Laboratory)

Thansk for your time!
--- end body ---
