https://chromium.googlesource.com/chromium/src/+/469bcf04ced0868049864010a367b0d56a73ffa7

Hi David,

Assigning 2 security bugs to you, related to TopDocumentRootScrollerController.

ClusterFuzz has detected this issue as fixed in range 418863:418870.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5827652806246400

Fuzzer: meacer_chromebot_extensions
Job Type: linux_ubsan_vptr_chrome
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x0ed239550bd8
Crash State:
  Bad-cast to blink::TopDocumentRootScrollerController from blink::RootScrollerController
  blink::PaintLayerCompositor::updateClippingOnCompositorLayers
  blink::PaintLayerCompositor::updateIfNeeded
  
Recommended Security Severity: Medium

Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_vptr_chrome&range=418637:418696
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_vptr_chrome&range=418863:418870

Unminimized Testcase: https://cluster-fuzz.appspot.com/download/AMIfv95QS8VqRQj4iGtVa3W5HDEM6cNqSz-CGIw2sHM34Oax2TiR-MbuexHPZy1H-JPUl64BWFHii8xD6_sYtaxqpVKyZFRxRV8udc1XTYVtZ1v1w99qmZXPYgdcKHU6j8JfgfhU0aEgqlgUO3ydTAxNGCQRmZV8evEvXwwgPEBLzcXFiICB3AQ?testcase_id=5827652806246400


Additional requirements: Requires Gestures

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 is verified as fixed, closing issue.

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