[llvm-bugs] Issue 27572 in oss-fuzz: llvm:clang-objc-fuzzer: Use-of-uninitialized-value in clang::Lexer::getTokenPrefixLength

[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-Medium Reported-2020-11-17
Type: Bug-Security

New issue 27572 by ClusterFuzz-External: llvm:clang-objc-fuzzer: Use-of-uninitialized-value in clang::Lexer::getTokenPrefixLength
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27572

Detailed Report: https://oss-fuzz.com/testcase?key=5735061403729920

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

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  clang::Lexer::getTokenPrefixLength
  Diag
  ProcessUCNEscape
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_msan_llvm&range=202003270244:202003280243

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5735061403729920

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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