Unable to find actual suspect through code search and also observing no CL under regression range, hence adding appropriate label and requesting someone from blink team to look in to this issue.

Thanks!

Lower to Pri-3 since it is caused by unusual HTML.

ClusterFuzz has detected this issue as fixed in range 575974:575975.

Detailed report: https://clusterfuzz.com/testcase?key=5931914784145408

Fuzzer: bj_broddelwerk
Job Type: windows_asan_chrome_no_sandbox
Platform Id: windows

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  blink::EditingIgnoresContent
  blink::PositionTemplate<class blink::EditingAlgorithm<class blink::FlatTreeTrave
  blink::ApplyBlockElementCommand::RangeForParagraphSplittingTextNodesIfNeeded
  
Sanitizer: address (ASAN)

Fixed: https://clusterfuzz.com/revisions?job=windows_asan_chrome_no_sandbox&range=575974:575975

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5931914784145408

See https://github.com/google/clusterfuzz-tools 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 5931914784145408 is verified as fixed, so closing issue as verified.

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