[llvm-bugs] Issue 20046 in oss-fuzz: llvm:llvm-isel-fuzzer--wasm32-O2: Heap-use-after-free in llvm::BasicBlock::getTerminator

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Reproducible  
Engine-libfuzzer OS-Linux Proj-llvm Security_Severity-High  
Reported-2020-01-13
Type: Bug-Security

New issue 20046 by ClusterFuzz-External: llvm:llvm-isel-fuzzer--wasm32-O2:  
Heap-use-after-free in llvm::BasicBlock::getTerminator
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20046

Detailed Report: https://oss-fuzz.com/testcase?key=5716633024987136

Project: llvm
Fuzzing Engine: libFuzzer
Fuzz Target: llvm-isel-fuzzer--wasm32-O2
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Heap-use-after-free READ 8
Crash Address: 0x6060000074e8
Crash State:
   llvm::BasicBlock::getTerminator
   computeKnownBitsFromOperator
   computeKnownBits

Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201912130427:201912200437

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5716633024987136

Issue filed automatically.

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