drott: this looks similar to  Issue 758478 . Do you mind taking a look please?

This is a serious security regression. If you are not able to fix this quickly, please revert the change that introduced it.

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

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Behdad, are these more instances of https://github.com/behdad/harfbuzz/issues/474 ?

Yes, looks like it.  I'll try to fix those soon.

Downgrading this to same severity as  issue 696729  and removing ReleaseBlock-Stable.

Automatically applying components based on information from OWNERS files. If this seems incorrect, please apply the Test-Predator-Wrong-Components label.

For more information, please see https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md.

The link referenced in the description is no longer valid.

ClusterFuzz has detected this issue as fixed in range 513517:513548.

Detailed report: https://clusterfuzz.com/testcase?key=6327734241591296

Fuzzer: libFuzzer_harfbuzz_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Incorrect-function-pointer-type
Crash Address: 
Crash State:
  _hb_blob_destroy_user_data
  _try_writable
  hb_blob_get_data_writable
  
Sanitizer: undefined (UBSAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=424217:424275
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=513517:513548

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6327734241591296

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.

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

ClusterFuzz testcase 6327734241591296 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

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