[llvm-bugs] Issue 7744 in oss-fuzz: llvm/clang-proto-fuzzer: Null-dereference READ in llvm::SSAUpdaterBulk::RewriteAllUses

[ClusterFuzz-External via monorail via llvm-bugs]

Comment #2 on issue 7744 by ClusterFuzz-External: llvm/clang-proto-fuzzer:  
Null-dereference READ in llvm::SSAUpdaterBulk::RewriteAllUses
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7744#c2

ClusterFuzz has detected this issue as fixed in range  
201804170535:201804171757.

Detailed report: https://oss-fuzz.com/testcase?key=5110725665095680

Project: llvm
Fuzzer: libFuzzer_llvm_clang-proto-fuzzer
Fuzz target binary: clang-proto-fuzzer
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000011
Crash State:
   llvm::SSAUpdaterBulk::RewriteAllUses
   llvm::JumpThreadingPass::ThreadEdge
   llvm::JumpThreadingPass::ProcessThreadableEdges

Sanitizer: address (ASAN)

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201804160529:201804170535
Fixed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201804170535:201804171757

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5110725665095680

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

If you suspect that the result above is incorrect, try re-doing that job on  
the test case report page.

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