[llvm-bugs] Issue 33870 in oss-fuzz: llvm:llvm-isel-fuzzer--aarch64-gisel: Heap-use-after-free in llvm::MetadataTracking::untrack

[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-2021-05-01
Type: Bug-Security

New issue 33870 by ClusterFuzz-External: llvm:llvm-isel-fuzzer--aarch64-gisel: Heap-use-after-free in llvm::MetadataTracking::untrack
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33870

Detailed Report: https://oss-fuzz.com/testcase?key=5625425813438464

Project: llvm
Fuzzing Engine: libFuzzer
Fuzz Target: llvm-isel-fuzzer--aarch64-gisel
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Heap-use-after-free READ 1
Crash Address: 0x60a000022368
Crash State:
  llvm::MetadataTracking::untrack
  llvm::MachineIRBuilder::setMF
  AArch64InstructionSelector::setupMF
  
Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=202104300622:202105010606

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5625425813438464

Issue filed automatically.

See https://google.github.io/oss-fuzz/advanced-topics/reproducing for instructions to reproduce this bug locally.
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