Find it and CL did not provide any possible suspect.
Using Code Search for the file, "LayoutListItem.cpp" assigning to the concern owner.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/c896e79e5ba348d7ed87438cd3a19d0176f3036d

@robhogan -- 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 451788:451857.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6025990540361728

Fuzzer: ifratric-browserfuzzer-v3
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Integer-overflow
Crash Address: 
Crash State:
  blink::LayoutListItem::calcValue
  updateValueNow
  value
  
Sanitizer: undefined (UBSAN)

Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_chrome&range=434178:434216
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_chrome&range=451788:451857

Reproducer Testcase: https://cluster-fuzz.appspot.com/download/AMIfv95X6_gpNR-e5J3mLuigQtjtKJhT8-5NYHJUhukDrKSzaQsZ92BzSvSKGQkVsoLi9MTRMwKNNofE4wT-mmRCODYK1eT79tg5a4nAElf121udF-rYGASVI_YHEEOGWVCt9FZjrZ_rSEKWwGkJrGym3Dx4qaPpYQ?testcase_id=6025990540361728


See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs 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 6025990540361728 is verified as fixed, so closing issue.

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