Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.

Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/c32b18d4361a2a2aa27ce70fbc78c771930c3caf (Make WebTaskRunner an alias to base::SingleThreadTaskRunner.).

If this is incorrect, please let us know why and apply the Test-Predator-Wrong-CLs label. If you aren't the correct owner for this issue, please unassign yourself as soon as possible so it can be re-triaged.

Are we sure this bug affects only Windows and macOS?

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.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

> Are we sure this bug affects only Windows and macOS?

Probably all platforms, this isn't OS-specific code.

danakj: could you please help triage/find an owner? Thanks

This looks like lifetime issues with the CanvasResourceProvider::ImageDecodeCache in Blink when a canvas gets upgraded from software to accelerated.

Sending over to Khushal.

ClusterFuzz has detected this issue as fixed in range 533758:533823.

Detailed report: https://clusterfuzz.com/testcase?key=6212986210091008

Fuzzer: inferno_canvas_wrecker
Job Type: mac_asan_chrome
Platform Id: mac

Crash Type: Heap-use-after-free READ 8
Crash Address: 0x61300009b700
Crash State:
  cc::PlaybackImageProvider::GetDecodedDrawImage
  cc::DrawImageRectOp::RasterWithFlags
  cc::SkiaPaintCanvas::drawImageRect
  
Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=mac_asan_chrome&range=532705:532746
Fixed: https://clusterfuzz.com/revisions?job=mac_asan_chrome&range=533758:533823

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6212986210091008

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.

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