[llvm-bugs] Issue 12435 in oss-fuzz: llvm/llvm-microsoft-demangle-fuzzer: Null-dereference READ in llvm::ms_demangle::Demangler::demangleVariableEncoding

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
CC: kcc at google.com, mascasa at google.com, jdevlieg... at apple.com,  
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Reproducible  
Engine-libfuzzer Proj-llvm Reported-2019-01-08
Type: Bug

New issue 12435 by ClusterFuzz-External:  
llvm/llvm-microsoft-demangle-fuzzer: Null-dereference READ in  
llvm::ms_demangle::Demangler::demangleVariableEncoding
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12435

Detailed report: https://oss-fuzz.com/testcase?key=5678733216710656

Project: llvm
Fuzzer: libFuzzer_llvm_llvm-microsoft-demangle-fuzzer
Fuzz target binary: llvm-microsoft-demangle-fuzzer
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000008
Crash State:
   llvm::ms_demangle::Demangler::demangleVariableEncoding
   llvm::ms_demangle::Demangler::demangleEncodedSymbol
   llvm::ms_demangle::Demangler::parse

Sanitizer: address (ASAN)

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201901070410:201901080410

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5678733216710656

Issue filed automatically.

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

When you fix this bug, please
   * mention the fix revision(s).
   * state whether the bug was a short-lived regression or an old bug in any  
stable releases.
   * add any other useful information.
This information can help downstream consumers.

If you need to contact the OSS-Fuzz team with a question, concern, or any  
other feedback, please file an issue at  
https://github.com/google/oss-fuzz/issues.

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