mmohammad@, why did you mark this bug as WontFix? It looks reproducible to me.

i didn't see this issue when i am regressing , Thanks for re-open the bug. Thank you .

Looks like my fix for  bug 641452  will fix this as well.

ClusterFuzz has detected this issue as fixed in range 427178:427235.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5698097584013312

Fuzzer: libfuzzer_sfntly_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x000000000070
Crash State:
  sfntly::ReadableFontData::SetCheckSumRanges
  sfntly::FontHeaderTable::FontHeaderTable
  sfntly::FontHeaderTable::Builder::SubBuildTable
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_asan&range=417024:417277
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_asan&range=427178:427235

Minimized Testcase (1.42 Kb): https://cluster-fuzz.appspot.com/download/AMIfv94xA5j8KO4pT8oh_xmrVDEYzE4Q_3jpiRmokHxIyFjpSEOsv-PZcpCbHgxNVxf8HCnPIZCYfMpw0y-tXLd0_xBvyZO6qOZUcid61RYMePqFeVp3l5OB5mmY_cO4t2LPvbhc3sqHVHuV3ljmv6yrjI8xXCb-3g?testcase_id=5698097584013312

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/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.

Removing EditIssue view restrictions from ClusterFuzz filed bugs. If you believe that this issue should still be restricted, please reapply the label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot