[llvm-bugs] Issue 3867 in oss-fuzz: llvm/clangd-fuzzer: Use-after-poison in llvm::yaml::Scanner::scanValue

monor… via monorail via llvm-bugs llvm-bugs at lists.llvm.org
Sat Oct 28 04:09:25 PDT 2017


Status: New
Owner: ----
CC: kcc at google.com,  mascasa at google.com,  jdevlieg... at apple.com,   
llvm-b... at lists.llvm.org,  v... at apple.com
Labels: ClusterFuzz Stability-Memory-AddressSanitizer Reproducible  
Engine-libfuzzer Proj-llvm Reported-2017-10-28

New issue 3867 by monor... at clusterfuzz-external.iam.gserviceaccount.com:  
llvm/clangd-fuzzer: Use-after-poison in llvm::yaml::Scanner::scanValue
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3867

Detailed report: https://oss-fuzz.com/testcase?key=4553604959567872

Project: llvm
Fuzzer: libFuzzer_llvm_clangd-fuzzer
Fuzz target binary: clangd-fuzzer
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Use-after-poison READ 8
Crash Address: 0x6210000029f0
Crash State:
   llvm::yaml::Scanner::scanValue
   llvm::yaml::Scanner::fetchMoreTokens
   llvm::yaml::Scanner::peekNext

Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201710260448:201710270453

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=4553604959567872

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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