[llvm-bugs] Issue 7560 in oss-fuzz: llvm/llvm-opt-fuzzer--x86_64-loop_vectorize: Heap-use-after-free in llvm::LoopVectorizationCostModel::setCostBasedWideningDecision

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
CC: kcc at google.com, mascasa at google.com, jdevlieg... at apple.com,  
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Reproducible  
Engine-libfuzzer Proj-llvm Reported-2018-04-11
Type: Bug-Security

New issue 7560 by ClusterFuzz-External:  
llvm/llvm-opt-fuzzer--x86_64-loop_vectorize: Heap-use-after-free in  
llvm::LoopVectorizationCostModel::setCostBasedWideningDecision
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7560

Detailed report: https://oss-fuzz.com/testcase?key=5746655065276416

Project: llvm
Fuzzer: libFuzzer_llvm_llvm-opt-fuzzer--x86_64-loop_vectorize
Fuzz target binary: llvm-opt-fuzzer--x86_64-loop_vectorize
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Heap-use-after-free READ 4
Crash Address: 0x6080000124e0
Crash State:
   llvm::LoopVectorizationCostModel::setCostBasedWideningDecision
   llvm::LoopVectorizationCostModel::collectUniformsAndScalars
   llvm::LoopVectorizationPlanner::plan

Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201802190622:201802200626

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5746655065276416

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 have questions for the OSS-Fuzz team, please file an issue at  
https://github.com/google/oss-fuzz/issues.

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