[llvm-bugs] Issue 16385 in oss-fuzz: llvm:llvm-isel-fuzzer--aarch64-O2: Container-overflow in MachineBlockPlacement::runOnMachineFunction

[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-Medium  
Reported-2019-08-12
Type: Bug-Security

New issue 16385 by ClusterFuzz-External: llvm:llvm-isel-fuzzer--aarch64-O2:  
Container-overflow in MachineBlockPlacement::runOnMachineFunction
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=16385

Detailed report: https://oss-fuzz.com/testcase?key=5751823645802496

Project: llvm
Fuzzing engine: libFuzzer
Fuzz target: llvm-isel-fuzzer--aarch64-O2
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Container-overflow READ 8
Crash Address: 0x60600001ec38
Crash State:
   MachineBlockPlacement::runOnMachineFunction
   llvm::MachineFunctionPass::runOnFunction
   llvm::FPPassManager::runOnFunction

Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201908100315:201908110313

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5751823645802496

Issue filed automatically.

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for  
instructions to reproduce this bug locally.

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