This is a serious security regression. If you are not able to fix this quickly, please revert the change that introduced it.

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

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May be related to  issue 757412 .

Re c#4, I suppose you meant either  bug 756523 .

Adding some folks who have touched loading code most recently. I don't have any ideas yet.

Can I get access to  issue 756523  and the detailed ClusterFuzz report above?

ClusterFuzz has detected this issue as fixed in range 497420:497430.

Detailed report: https://clusterfuzz.com/testcase?key=4881658682802176

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_ubsan_vptr_content_shell_drt
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x087dcc69ca20
Crash State:
  Bad-cast to content::ResourceMessageFilter from invalid vptr
  content::ResourceMessageFilter::CreateLoaderAndStart
  content::mojom::URLLoaderFactoryStubDispatch::Accept
  
Sanitizer: undefined (UBSAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=495868:495869
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=497420:497430

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4881658682802176

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 4881658682802176 is verified as fixed, so closing issue as verified.

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