NULL pointer dereference in AP4_AtomSampleTable::GetSample (Ap4AtomSampleTable.cpp)

[asarubbo]

On 1.5.0-617:

# mp42aac $FILE out.aac
ASAN:DEADLYSIGNAL
=================================================================
==6365==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000005cf94c bp 0x7fff5857d580 sp 0x7fff5857d4c0 T0)
==6365==The signal is caused by a READ memory access.
==6365==Hint: address points to the zero page.
    #0 0x5cf94b in AP4_AtomSampleTable::GetSample(unsigned int, AP4_Sample&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomSampleTable.cpp
    #1 0x58d158 in AP4_Track::GetSample(unsigned int, AP4_Sample&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4Track.cpp:435:43
    #2 0x58d158 in AP4_Track::ReadSample(unsigned int, AP4_Sample&, AP4_DataBuffer&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4Track.cpp:469
    #3 0x5430ad in WriteSamples(AP4_Track*, AP4_SampleDescription*, AP4_ByteStream*) /tmp/Bento4-1.5.0-617/Source/C++/Apps/Mp42Aac/Mp42Aac.cpp:192:12
    #4 0x5430ad in main /tmp/Bento4-1.5.0-617/Source/C++/Apps/Mp42Aac/Mp42Aac.cpp:274
    #5 0x7f41deb72680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
    #6 0x44f3f8 in _start (/usr/bin/mp42aac+0x44f3f8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomSampleTable.cpp in AP4_AtomSampleTable::GetSample(unsigned int, AP4_Sample&)
==6365==ABORTING
Audio Track:
  duration: 7848 ms
  sample count: 169

Testcase:
https://github.com/asarubbo/poc/blob/master/00337-bento4-NULLptr-AP4_AtomSampleTable_GetSample

[barbibulle]

Fixed in master branch