[llvm-bugs] Issue 5400 in oss-fuzz: llvm/llvm-dwarfdump-fuzzer: Heap-buffer-overflow in llvm::StringMapImpl::LookupBucketFor

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
CC: kcc at google.com, mascasa at google.com, jdevlieg... at apple.com,  
igm... at gmail.com, llvm-b... at lists.llvm.org, v... at apple.com,  
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Reproducible  
Engine-libfuzzer Proj-llvm Reported-2018-01-16
Type: Bug-Security

New issue 5400 by ClusterFuzz-External: llvm/llvm-dwarfdump-fuzzer:  
Heap-buffer-overflow in llvm::StringMapImpl::LookupBucketFor
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5400

Detailed report: https://oss-fuzz.com/testcase?key=4880755009257472

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

Crash Type: Heap-buffer-overflow READ 1
Crash Address: 0x60b00000020e
Crash State:
   llvm::StringMapImpl::LookupBucketFor
   std::__1::pair<llvm::StringMapIterator<char>, bool> llvm::StringMap<char,  
llvm::
   llvm::object::WasmObjectFile::parseLinkingSectionComdat

Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201801090613:201801100627

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=4880755009257472

Issue filed automatically.

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for  
more information.

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 have questions for the OSS-Fuzz team, please file an issue at  
https://github.com/google/oss-fuzz/issues.

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