[llvm-bugs] Issue 23204 in oss-fuzz: llvm:clang-fuzzer: Heap-use-after-free in clang::Parser::isCXXDeclarationSpecifier

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Reproducible Engine-libfuzzer OS-Linux Proj-llvm Security_Severity-High Reported-2020-06-08
Type: Bug-Security

New issue 23204 by ClusterFuzz-External: llvm:clang-fuzzer: Heap-use-after-free in clang::Parser::isCXXDeclarationSpecifier
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=23204

Detailed Report: https://oss-fuzz.com/testcase?key=5732388020944896

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

Crash Type: Heap-use-after-free READ 4
Crash Address: 0x6060000056e0
Crash State:
  clang::Parser::isCXXDeclarationSpecifier
  clang::Parser::isCXXSimpleDeclaration
  clang::Parser::ParseStatementOrDeclarationAfterAttributes
  
Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=202004060250:202004070254

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5732388020944896

Issue filed automatically.

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