[llvm-bugs] Issue 4908 in oss-fuzz: llvm/llvm-isel-fuzzer--aarch64-gisel: Null-dereference READ in llvm::IRMutator::mutateModule

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
CC: kcc at google.com, mascasa at google.com, jdevlieg... at apple.com,  
igm... at gmail.com, llvm-b... at lists.llvm.org, v... at apple.com,  
akils... at apple.com
Labels: ClusterFuzz Stability-Memory-AddressSanitizer Unreproducible  
Engine-libfuzzer Proj-llvm Reported-2018-01-03
Type: Bug

New issue 4908 by ClusterFuzz-External:  
llvm/llvm-isel-fuzzer--aarch64-gisel: Null-dereference READ in  
llvm::IRMutator::mutateModule
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4908

Detailed report: https://oss-fuzz.com/testcase?key=5853001831940096

Project: llvm
Fuzzer: libFuzzer_llvm_llvm-isel-fuzzer--aarch64-gisel
Fuzz target binary: llvm-isel-fuzzer--aarch64-gisel
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
   llvm::IRMutator::mutateModule
   LLVMFuzzerCustomMutator

Sanitizer: address (ASAN)

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5853001831940096

Issue filed automatically.

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for  
more information.

Note: This crash might not be reproducible with the provided testcase. That  
said, for the past 14 days we've been seeing this crash frequently. If you  
are unable to reproduce this, please try a speculative fix based on the  
crash stacktrace in the report. The fix can be verified by looking at the  
crash statistics in the report, a day after the fix is deployed. We will  
auto-close the bug if the crash is not seen for 14 days.

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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