[llvm-bugs] Issue 15534 in oss-fuzz: llvm/llvm-opt-fuzzer--x86_64-loop_unroll: Null-dereference READ in BitcodeReader::parseFunctionBody

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
CC: k...@google.com, masc...@google.com, jdevlieg...@apple.com,  
igm...@gmail.com, mit...@google.com, bigchees...@gmail.com,  
eney...@google.com, llvm-b...@lists.llvm.org, j...@chromium.org,  
v...@apple.com, mitchphi...@outlook.com, xpl...@gmail.com,  
akils...@apple.com
Labels: ClusterFuzz Stability-Memory-AddressSanitizer Reproducible  
Engine-libfuzzer OS-Linux Proj-llvm Reported-2019-06-28
Type: Bug
New issue 15534 by ClusterFuzz-External:  
llvm/llvm-opt-fuzzer--x86_64-loop_unroll: Null-dereference READ in  
BitcodeReader::parseFunctionBody
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15534

Detailed report: https://oss-fuzz.com/testcase?key=5685841600446464

Project: llvm
Fuzzer: libFuzzer_llvm_llvm-opt-fuzzer--x86_64-loop_unroll
Fuzz target binary: llvm-opt-fuzzer--x86_64-loop_unroll
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000008
Crash State:
  BitcodeReader::parseFunctionBody
  BitcodeReader::materialize
  BitcodeReader::materializeModule

Sanitizer: address (ASAN)

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201906270304:201906280305

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5685841600446464

Issue filed automatically.

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for  
instructions to reproduce this bug locally.

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