[llvm-bugs] Issue 18208 in oss-fuzz: llvm:llvm-opt-fuzzer--x86_64-loop_unroll: Use-of-uninitialized-value in bool llvm::DenseMapBase<llvm::DenseMap<llvm::StringRef, llvm::detail::DenseSetEm

[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 Reproducible Stability-Memory-MemorySanitizer  
Engine-libfuzzer OS-Linux Proj-llvm Security_Severity-Medium  
Reported-2019-10-14
Type: Bug-Security

New issue 18208 by ClusterFuzz-External:  
llvm:llvm-opt-fuzzer--x86_64-loop_unroll: Use-of-uninitialized-value in  
bool llvm::DenseMapBase<llvm::DenseMap<llvm::StringRef,  
llvm::detail::DenseSetEm
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18208

Detailed Report: https://oss-fuzz.com/testcase?key=5077047453417472

Project: llvm
Fuzzing Engine: libFuzzer
Fuzz Target: llvm-opt-fuzzer--x86_64-loop_unroll
Job Type: libfuzzer_msan_llvm
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address:
Crash State:
   bool llvm::DenseMapBase<llvm::DenseMap<llvm::StringRef,  
llvm::detail::DenseSetEm
   llvm::detail::DenseSetPair<llvm::StringRef>*  
llvm::DenseMapBase<llvm::DenseMap<l
   llvm::UniqueStringSaver::save

Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Crash Revision:  
https://oss-fuzz.com/revisions?job=libfuzzer_msan_llvm&revision=201906300300

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5077047453417472

Issue filed automatically.

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instructions to reproduce this bug locally.
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