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

[ClusterFuzz-External via monorail via llvm-bugs]

Comment #2 on issue 3867 by ClusterFuzz-External: llvm/clangd-fuzzer:  
Use-after-poison in llvm::yaml::Scanner::scanValue
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3867#c2

ClusterFuzz has detected this issue as fixed in range  
201711160610:201712080609.

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
Fixed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201711160610:201712080609

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

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

If you suspect that the result above is incorrect, try re-doing that job on  
the test case report page.

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