Detailed report: https://clusterfuzz.com/testcase?key=5668436061192192

Fuzzer: libFuzzer_sfntly_fuzzer
Fuzz target binary: sfntly_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Integer-overflow
Crash Address: 
Crash State:
  sfntly::IndexSubTableFormat5::Builder::DataLength
  sfntly::IndexSubTableFormat5::Builder::CreateBuilder
  sfntly::IndexSubTable::Builder::CreateBuilder
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=417039:417261

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5668436061192192

Issue filed automatically.

See https://github.com/google/clusterfuzz-tools for instructions to reproduce this bug locally.