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Issue metadata

Status: Verified
Owner: ----
Closed: May 2018
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 1
Type: Bug



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Null-dereference READ in blink::SlotAssignment::Trace

Project Member Reported by ClusterFuzz, May 3 2018

Issue description

Detailed report: https://clusterfuzz.com/testcase?key=6448627837566976

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_msan_chrome
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000018
Crash State:
  blink::SlotAssignment::Trace
  blink::ScriptWrappable::Wrap
  blink::TextOffsetMapping::TextOffsetMapping
  
Sanitizer: memory (MSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_msan_chrome&range=550607:550608

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6448627837566976

Issue filed automatically.

See https://github.com/google/clusterfuzz-tools for more information.
 
Project Member

Comment 1 by ClusterFuzz, May 3 2018

Components: Blink>Bindings Blink>DOM
Labels: Test-Predator-Auto-Components
Automatically applying components based on crash stacktrace and information from OWNERS files.

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

Comment 2 by ClusterFuzz, May 3 2018

Labels: Test-Predator-Auto-Owner
Owner: h...@chromium.org
Status: Assigned (was: Untriaged)
Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/1f109d9c516640dda836493b24fd033da64411ff (Roll clang 328716:329921.).

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.

Comment 3 by h...@chromium.org, May 4 2018

Owner: ----
Status: Available (was: Assigned)
It's possible the clang roll changed something in msan of course, but someone who owns the code where the null-dereference occurred should probably take a look.
Project Member

Comment 4 by ClusterFuzz, May 4 2018

ClusterFuzz has detected this issue as fixed in range 555697:555698.

Detailed report: https://clusterfuzz.com/testcase?key=6448627837566976

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_msan_chrome
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000018
Crash State:
  blink::SlotAssignment::Trace
  blink::ScriptWrappable::Wrap
  blink::TextOffsetMapping::TextOffsetMapping
  
Sanitizer: memory (MSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_msan_chrome&range=550607:550608
Fixed: https://clusterfuzz.com/revisions?job=linux_msan_chrome&range=555697:555698

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6448627837566976

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.
Project Member

Comment 5 by ClusterFuzz, May 4 2018

Labels: ClusterFuzz-Verified
Status: Verified (was: Available)
ClusterFuzz testcase 6448627837566976 is verified as fixed, so closing issue as verified.

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

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