Status: New
Owner: ----
CC: elfut...@sourceware.org, da...@adalogics.com, evv...@gmail.com, izzeem@google.com 
Labels: ClusterFuzz Stability-Memory-AddressSanitizer Unreproducible Engine-libfuzzer OS-Linux Proj-elfutils Reported-2023-09-06
Type: Bug

New issue 62071 by ClusterFuzz-External: elfutils:fuzz-libdwfl: Null-dereference READ in chunk_compare
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=62071

Detailed Report: https://oss-fuzz.com/testcase?key=5999675550072832

Project: elfutils
Fuzzing Engine: libFuzzer
Fuzz Target: fuzz-libdwfl
Job Type: libfuzzer_asan_i386_elfutils
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000a0
Crash State:
  chunk_compare
  __tsearch
  elf_getdata_rawchunk
  
Sanitizer: address (ASAN)

Crash Revision: https://oss-fuzz.com/revisions?job=libfuzzer_asan_i386_elfutils&revision=202308240000

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5999675550072832

Issue filed automatically.

See https://google.github.io/oss-fuzz/advanced-topics/reproducing for instructions to reproduce this bug locally.

************************* UNREPRODUCIBLE *************************
Note: This crash might not be reproducible with the provided testcase. That said, for the past 14 days, we've been seeing this crash frequently.

It may be possible to reproduce by trying the following options:
- Run testcase multiple times for a longer duration.
- Run fuzzing without testcase argument to hit the same crash signature.

If it still does not reproduce, try a speculative fix based on the crash stacktrace and verify if it works by looking at the crash statistics in the report. We will auto-close the bug if the crash is not seen for 14 days.
******************************************************************
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