[llvm-bugs] Issue 4559 in oss-fuzz: llvm/clangd-fuzzer: Null-dereference READ in void llvm::yaml::skip<llvm::yaml::MappingNode>

[ClusterFuzz-External via monorail via llvm-bugs]

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-2017-12-08
Type: Bug

New issue 4559 by ClusterFuzz-External: llvm/clangd-fuzzer:  
Null-dereference READ in void llvm::yaml::skip<llvm::yaml::MappingNode>
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4559

Detailed report: https://oss-fuzz.com/testcase?key=5110174017650688

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

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
   void llvm::yaml::skip<llvm::yaml::MappingNode>
   void llvm::yaml::skip<llvm::yaml::MappingNode>
   void llvm::yaml::skip<llvm::yaml::MappingNode>

Sanitizer: address (ASAN)

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

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5110174017650688

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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