[llvm-bugs] Issue 21152 in oss-fuzz: llvm:clang-fuzzer: Segv on unknown address in clang::Sema::LookupTemplateName

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
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Labels: ClusterFuzz Reproducible Stability-Memory-MemorySanitizer Engine-libfuzzer OS-Linux Proj-llvm Security_Severity-High Reported-2020-03-10
Type: Bug-Security

New issue 21152 by ClusterFuzz-External: llvm:clang-fuzzer: Segv on unknown address in clang::Sema::LookupTemplateName
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21152

Detailed Report: https://oss-fuzz.com/testcase?key=5637110368567296

Project: llvm
Fuzzing Engine: libFuzzer
Fuzz Target: clang-fuzzer
Job Type: libfuzzer_msan_llvm
Platform Id: linux

Crash Type: Segv on unknown address
Crash Address: 
Crash State:
  clang::Sema::LookupTemplateName
  clang::Sema::isTemplateName
  clang::Parser::ParseOptionalCXXScopeSpecifier
  
Sanitizer: memory (MSAN)

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_msan_llvm&range=201911200438:201911230451

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5637110368567296

Issue filed automatically.

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