[llvm-bugs] Issue 10275 in oss-fuzz: llvm/clang-fuzzer: Heap-use-after-free in clang::Sema::ActOnBlockStmtExpr

[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, eneyman at google.com, llvm-b... at lists.llvm.org,  
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Reproducible  
Engine-libfuzzer Proj-llvm Security_Severity-High Reported-2018-09-09
Type: Bug-Security

New issue 10275 by ClusterFuzz-External: llvm/clang-fuzzer:  
Heap-use-after-free in clang::Sema::ActOnBlockStmtExpr
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10275

Detailed report: https://oss-fuzz.com/testcase?key=5651214377680896

Project: llvm
Fuzzer: libFuzzer_llvm_clang-fuzzer
Fuzz target binary: clang-fuzzer
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Heap-use-after-free READ 8
Crash Address: 0x61b000003750
Crash State:
   clang::Sema::ActOnBlockStmtExpr
   clang::Parser::ParseBlockLiteralExpression
   clang::Parser::ParseCastExpression

Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201809080127:201809090127

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5651214377680896

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 need to contact the OSS-Fuzz team with a question, concern, or any  
other feedback, please file an issue at  
https://github.com/google/oss-fuzz/issues.

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