Comment #1 on issue 62071 by evv...@gmail.com: elfutils:fuzz-libdwfl:
Null-dereference READ in chunk_compare
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=62071#c1
```
SCARINESS: 10 (null-deref)
#0 0x82d35d1 in chunk_compare
/src/elfutils/libelf/elf_getdata_rawchunk.c:49:25
#1 0xf7caab3a in __tsearch
#2 0x8156826 in __interceptor_tsearch
/src/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:6057:15
#3 0x82d2a8a in elf_getdata_rawchunk
/src/elfutils/libelf/elf_getdata_rawchunk.c:98:28
#4 0x81f4139 in find_elf_build_id
/src/elfutils/libdwelf/dwelf_elf_gnu_build_id.c:88:28
#5 0x81f3a28 in __libdwfl_find_elf_build_id
/src/elfutils/libdwelf/dwelf_elf_gnu_build_id.c:142:10
#6 0x82795e8 in __libdwfl_find_build_id
/src/elfutils/libdwfl/dwfl_module_build_id.c:70:16
#7 0x82795e8 in dwfl_module_build_id
/src/elfutils/libdwfl/dwfl_module_build_id.c:91:20
#8 0x81d7ec7 in dwfl_standard_find_debuginfo
/src/elfutils/libdwfl/find-debuginfo.c:365:19
#9 0x81d3340 in find_debuginfo
/src/elfutils/libdwfl/dwfl_module_getdwarf.c:538:19
#10 0x81cff0f in find_dw
/src/elfutils/libdwfl/dwfl_module_getdwarf.c:1412:16
#11 0x81cff0f in dwfl_module_getdwarf
/src/elfutils/libdwfl/dwfl_module_getdwarf.c:1446:3
#12 0x81cad03 in LLVMFuzzerTestOneInput /src/fuzz-libdwfl.c:54:3
#13 0x808ba2e in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*,
unsigned int) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#14 0x808b168 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned int,
bool, fuzzer::InputInfo*, bool, bool*)
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:514:3
#15 0x808cfdd in
fuzzer::Fuzzer::ReadAndExecuteSeedCorpora(std::__Fuzzer::vector<fuzzer::SizedFile,
std::__Fuzzer::allocator<fuzzer::SizedFile> >&)
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:826:7
#16 0x808d1de in
fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile,
std::__Fuzzer::allocator<fuzzer::SizedFile> >&)
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:857:3
#17 0x807c3fc in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char
const*, unsigned int))
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#18 0x80a6177 in main
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
#19 0xf7bc5ed4 in __libc_start_main
#20 0x806dad5 in _start
```
The fuzz target can be found at
https://github.com/google/oss-fuzz/blob/master/projects/elfutils/fuzz-libdwfl.c
OSS-Fuzz says the fuzz target crashed on i386 sporadically and it isn't
reliably reproducible anymore so it could be a glitch of some sort.
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