[llvm-bugs] Issue 28411 in oss-fuzz: llvm:llvm-isel-fuzzer--x86_64-O2: Use-after-poison in llvm::SelectionDAG::getNode

[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-2020-12-08
Type: Bug-Security

New issue 28411 by ClusterFuzz-External: llvm:llvm-isel-fuzzer--x86_64-O2: Use-after-poison in llvm::SelectionDAG::getNode
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28411

Detailed Report: https://oss-fuzz.com/testcase?key=4861603086467072

Project: llvm
Fuzzing Engine: libFuzzer
Fuzz Target: llvm-isel-fuzzer--x86_64-O2
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Use-after-poison READ 2
Crash Address: 0x62100004b1aa
Crash State:
  llvm::SelectionDAG::getNode
  llvm::SelectionDAG::getNode
  DAGCombiner::visit
  
Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=202012060612:202012070611

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=4861603086467072

Issue filed automatically.

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