Predator and CL could not provide any possible suspects.
Using Code Search for the file, "GrClip.h" assigning to concern review owner.

Suspecting Commit#
https://skia.googlesource.com/skia.git/+/348060fa820e1ee7a4fd246afe517a80a9ef311d

@bsalomon -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

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The link referenced in the description is no longer valid.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 513674:513694.

Detailed report: https://clusterfuzz.com/testcase?key=6142155415617536

Fuzzer: libFuzzer_paint_op_buffer_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Integer-overflow
Crash Address: 
Crash State:
  bool GrClip::IsInsideClip<SkIRect>
  GrClipStackClip::apply
  GrRenderTargetContext::addDrawOp
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=496919:496951
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=513674:513694

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6142155415617536

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 6142155415617536 is verified as fixed, so closing issue as verified.

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