Predator and CL did not provide any possible suspect.
Using Code Search for the file, "GrAtlasGlyphCache.h" assigning to the concern owner.

Suspecting Commit#
https://skia.googlesource.com/skia.git/+/6d342285a4546b54cb17570aae7eeb8a123c81ae

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

ClusterFuzz has detected this issue as fixed in range 491148:491245.

Detailed report: https://clusterfuzz.com/testcase?key=5395530497916928

Fuzzer: libFuzzer_paint_op_buffer_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  GrAtlasGlyphCache::hasGlyph
  void GrAtlasTextBlob::regenInOp<false, false, true, false>
  GrAtlasTextBlob::regenInOp
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=489393:489475
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=491148:491245

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5395530497916928


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.

ClusterFuzz testcase 5395530497916928 is verified as fixed, so closing issue as verified.

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