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A global-buffer-overflow has occurred when running mp4info #301

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@swtkiwi

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@swtkiwi

A global-buffer-overflow has occurred when running ./mp4info

=================================================================
==10109==ERROR: AddressSanitizer: global-buffer-overflow on address 0x000000962cc1 at pc 0x7fb7f844e935 bp 0x7ffe06fca470 sp 0x7ffe06fc9c18
READ of size 28 at 0x000000962cc1 thread T0
    #0 0x7fb7f844e934 in __asan_memcpy (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x8c934)
    #1 0x56ff54 in memcpy /usr/include/x86_64-linux-gnu/bits/string3.h:53
    #2 0x56ff54 in AP4_MemoryByteStream::WritePartial(void const*, unsigned int, unsigned int&) /home/swt_fuzz/Bento4/Source/C++/Core/Ap4ByteStream.cpp:789
    #3 0x5739eb in AP4_ByteStream::Write(void const*, unsigned int) /home/swt_fuzz/Bento4/Source/C++/Core/Ap4ByteStream.cpp:78
    #4 0x55bf16 in AP4_HdlrAtom::WriteFields(AP4_ByteStream&) /home/swt_fuzz/Bento4/Source/C++/Core/Ap4HdlrAtom.cpp:125
    #5 0x587264 in AP4_Atom::Write(AP4_ByteStream&) /home/swt_fuzz/Bento4/Source/C++/Core/Ap4Atom.cpp:229
    #6 0x587264 in AP4_Atom::Clone() /home/swt_fuzz/Bento4/Source/C++/Core/Ap4Atom.cpp:316
    #7 0x54a772 in AP4_SampleDescription::AP4_SampleDescription(AP4_SampleDescription::Type, unsigned int, AP4_AtomParent*) /home/swt_fuzz/Bento4/Source/C++/Core/Ap4SampleDescription.cpp:127
    #8 0x54a772 in AP4_AvcSampleDescription::AP4_AvcSampleDescription(unsigned int, unsigned short, unsigned short, unsigned short, char const*, AP4_AtomParent*) /home/swt_fuzz/Bento4/Source/C++/Core/Ap4SampleDescription.cpp:353
    #9 0x699fa1 in AP4_AvcSampleEntry::ToSampleDescription() /home/swt_fuzz/Bento4/Source/C++/Core/Ap4SampleEntry.cpp:1028
    #10 0x68659f in AP4_StsdAtom::GetSampleDescription(unsigned int) /home/swt_fuzz/Bento4/Source/C++/Core/Ap4StsdAtom.cpp:179
    #11 0x456927 in ShowTrackInfo_Text /home/swt_fuzz/Bento4/Source/C++/Apps/Mp4Info/Mp4Info.cpp:1089
    #12 0x457aaf in ShowTrackInfo /home/swt_fuzz/Bento4/Source/C++/Apps/Mp4Info/Mp4Info.cpp:1213
    #13 0x457aaf in ShowTracks /home/swt_fuzz/Bento4/Source/C++/Apps/Mp4Info/Mp4Info.cpp:1323
    #14 0x44030d in main /home/swt_fuzz/Bento4/Source/C++/Apps/Mp4Info/Mp4Info.cpp:1587
    #15 0x7fb7f7a8082f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #16 0x446508 in _start (/home/swt_fuzz/Bento4/cmakebuild/mp4info+0x446508)

0x000000962cc1 is located 0 bytes to the right of global variable 'EmptyString' defined in '/home/swt_fuzz/Bento4/Source/C++/Core/Ap4String.cpp:39:6' (0x962cc0) of size 1
  'EmptyString' is ascii string ''
SUMMARY: AddressSanitizer: global-buffer-overflow ??:0 __asan_memcpy
Shadow bytes around the buggy address:
  0x000080124540: 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9
  0x000080124550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x000080124560: 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9
  0x000080124570: 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9
  0x000080124580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x000080124590: 00 00 00 00 00 00 00 00[01]f9 f9 f9 f9 f9 f9 f9
  0x0000801245a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000801245b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000801245c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000801245d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000801245e0: 00 00 00 00 00 00 00 00 00 00 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
==10109==ABORTING

The testing program is mp4info.
And the input file has been put at:
https://github.com/fCorleone/fuzz_programs/blob/master/Bento4/test9.dms

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