[llvm-bugs] Issue 18955 in oss-fuzz: llvm:clang-fuzzer: Null-dereference READ in clang::TagType const* clang::Type::castAs<clang::TagType>

[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 Reported-2019-11-15
Type: Bug

New issue 18955 by ClusterFuzz-External: llvm:clang-fuzzer:  
Null-dereference READ in clang::TagType const*  
clang::Type::castAs<clang::TagType>
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18955

Detailed Report: https://oss-fuzz.com/testcase?key=5759333988302848

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

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
   clang::TagType const* clang::Type::castAs<clang::TagType>
   clang::Sema::LookupTemplateName
   clang::Sema::isTemplateName

Sanitizer: memory (MSAN)

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_msan_llvm&range=201906300300:201910150335

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5759333988302848

Issue filed automatically.

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