An unhandled memory allocation failure in Core/Ap48bdlAtom.cpp of Bento 1.5.1-628 causes a NULL pointer dereference, leading to a denial of service (DOS).
There is a null pointer dereference caused by unhandled exhaustive memory usage in Ap48bdlAtom.cpp.

Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.6 LTS
Release:	16.04
Codename:	xenial
gcc: 5.4.0

To reproduce the bug,
compile the project with flag
DCMAKE_C_FLAGS=-g -m32 -fsanitize=address,undefined

then run:
./mp42aac input /dev/null

The reason is that the malloc size does not check and easily lead to memory allocation failure.
![image](https://user-images.githubusercontent.com/7632714/62784397-f5302000-baf0-11e9-8876-4dc122aa9d11.png)
![image](https://user-images.githubusercontent.com/7632714/62784507-388a8e80-baf1-11e9-8a23-5b066cdbaedd.png)

Here is the trace reported by ASAN:
==131030==WARNING: AddressSanitizer failed to allocate 0xffe1fff1 bytes
==131030==AddressSanitizer's allocator is terminating the process instead of returning 0
==131030==If you don't like this behavior set allocator_may_return_null=1
==131030==AddressSanitizer CHECK failed: ../../../../../src/libsanitizer/sanitizer_common/sanitizer_allocator.cc:147 "((0)) != (0)" (0x0, 0x0)
    #0 0xf71fe797  (/usr/lib32/libasan.so.2+0x9f797)
    #1 0xf7203a69 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) (/usr/lib32/libasan.so.2+0xa4a69)
    #2 0xf717507b  (/usr/lib32/libasan.so.2+0x1607b)
    #3 0xf7201e80  (/usr/lib32/libasan.so.2+0xa2e80)
    #4 0xf717a229  (/usr/lib32/libasan.so.2+0x1b229)
    #5 0xf71f6e16 in operator new[](unsigned int) (/usr/lib32/libasan.so.2+0x97e16)
    #6 0x877ebaf in AP4_DataBuffer::AP4_DataBuffer(unsigned int) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4DataBuffer.cpp:55
    #7 0x8ba5673 in AP4_8bdlAtom::AP4_8bdlAtom(unsigned int, AP4_ByteStream&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap48bdlAtom.cpp:76
    #8 0x8ba5673 in AP4_8bdlAtom::Create(unsigned int, AP4_ByteStream&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap48bdlAtom.cpp:64
    #9 0x82e10dc in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:534
    #10 0x8301ca3 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:225
    #11 0x82b6bae in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #12 0x82b6bae in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #13 0x841a898 in AP4_MoovAtom::AP4_MoovAtom(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4MoovAtom.cpp:80
    #14 0x82e2631 in AP4_MoovAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4MoovAtom.h:56
    #15 0x82e2631 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:363
    #16 0x82fa1f7 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:225
    #17 0x82fa1f7 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:151
    #18 0x809a044 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4File.cpp:104
    #19 0x809a044 in AP4_File::AP4_File(AP4_ByteStream&, bool) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4File.cpp:78
    #20 0x8082ce7 in main /mnt/data/playground/mp42-a/Source/C++/Apps/Mp42Aac/Mp42Aac.cpp:250
    #21 0xf697f636 in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x18636)
    #22 0x808df1b  (/mnt/data/playground/mp42-patch/Build/mp42aac+0x808df1b)

The poc input:
[poc_input6.zip](https://github.com/axiomatic-systems/Bento4/files/3486674/poc_input6.zip)



Null pointer dereference caused by unhandled exhaustive memory usage
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : Null pointer dereference caused by unhandled exhaustive memory usage
Issue date:

--- start body ---
There is a null pointer dereference caused by unhandled exhaustive memory usage in Ap48bdlAtom.cpp.

Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.6 LTS
Release:	16.04
Codename:	xenial
gcc: 5.4.0

To reproduce the bug,
compile the project with flag
DCMAKE_C_FLAGS=-g -m32 -fsanitize=address,undefined

then run:
./mp42aac input /dev/null

The reason is that the malloc size does not check and easily lead to memory allocation failure.
![image](https://user-images.githubusercontent.com/7632714/62784397-f5302000-baf0-11e9-8876-4dc122aa9d11.png)
![image](https://user-images.githubusercontent.com/7632714/62784507-388a8e80-baf1-11e9-8a23-5b066cdbaedd.png)

Here is the trace reported by ASAN:
==131030==WARNING: AddressSanitizer failed to allocate 0xffe1fff1 bytes
==131030==AddressSanitizer's allocator is terminating the process instead of returning 0
==131030==If you don't like this behavior set allocator_may_return_null=1
==131030==AddressSanitizer CHECK failed: ../../../../../src/libsanitizer/sanitizer_common/sanitizer_allocator.cc:147 "((0)) != (0)" (0x0, 0x0)
    #0 0xf71fe797  (/usr/lib32/libasan.so.2+0x9f797)
    #1 0xf7203a69 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) (/usr/lib32/libasan.so.2+0xa4a69)
    #2 0xf717507b  (/usr/lib32/libasan.so.2+0x1607b)
    #3 0xf7201e80  (/usr/lib32/libasan.so.2+0xa2e80)
    #4 0xf717a229  (/usr/lib32/libasan.so.2+0x1b229)
    #5 0xf71f6e16 in operator new[](unsigned int) (/usr/lib32/libasan.so.2+0x97e16)
    #6 0x877ebaf in AP4_DataBuffer::AP4_DataBuffer(unsigned int) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4DataBuffer.cpp:55
    #7 0x8ba5673 in AP4_8bdlAtom::AP4_8bdlAtom(unsigned int, AP4_ByteStream&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap48bdlAtom.cpp:76
    #8 0x8ba5673 in AP4_8bdlAtom::Create(unsigned int, AP4_ByteStream&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap48bdlAtom.cpp:64
    #9 0x82e10dc in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:534
    #10 0x8301ca3 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:225
    #11 0x82b6bae in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4ContainerAtom.cpp:194
    #12 0x82b6bae in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4ContainerAtom.cpp:139
    #13 0x841a898 in AP4_MoovAtom::AP4_MoovAtom(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4MoovAtom.cpp:80
    #14 0x82e2631 in AP4_MoovAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4MoovAtom.h:56
    #15 0x82e2631 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:363
    #16 0x82fa1f7 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:225
    #17 0x82fa1f7 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4AtomFactory.cpp:151
    #18 0x809a044 in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4File.cpp:104
    #19 0x809a044 in AP4_File::AP4_File(AP4_ByteStream&, bool) /mnt/data/playground/mp42-a/Source/C++/Core/Ap4File.cpp:78
    #20 0x8082ce7 in main /mnt/data/playground/mp42-a/Source/C++/Apps/Mp42Aac/Mp42Aac.cpp:250
    #21 0xf697f636 in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x18636)
    #22 0x808df1b  (/mnt/data/playground/mp42-patch/Build/mp42aac+0x808df1b)

The poc input:
[poc_input6.zip](https://github.com/axiomatic-systems/Bento4/files/3486674/poc_input6.zip)



--- end body ---
