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Issue 736424 link

Starred by 2 users

Issue metadata

Status: Verified
Owner:
Closed: Nov 2017
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Windows , Mac
Pri: 1
Type: Bug
Team-Accessibility

Blocking:
issue 688085



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Null-dereference READ in blink::AXObjectCacheImpl::GetOrCreateAXID

Project Member Reported by ClusterFuzz, Jun 23 2017

Issue description

Detailed report: https://clusterfuzz.com/testcase?key=5801145229639680

Fuzzer: inferno_layout_test_unmodified
Job Type: mac_asan_content_shell
Platform Id: mac

Crash Type: Null-dereference READ
Crash Address: 0x000000000078
Crash State:
  blink::AXObjectCacheImpl::GetOrCreateAXID
  blink::AXObjectCacheImpl::GetOrCreate
  blink::AXMenuList::AddChildren
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=480776:480824

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5801145229639680


Issue filed automatically.

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.
 
Project Member

Comment 1 by ClusterFuzz, Jun 24 2017

Labels: OS-Linux

Comment 2 by tkent@chromium.org, Jun 26 2017

Components: Blink>Accessibility
Cc: msrchandra@chromium.org
Labels: M-61 Test-Predator-Correct-CLs
Owner: nverne@chromium.org
Status: Assigned (was: Untriaged)
The result is a list of CLs that change the crashed files. 
Author: Nicholas Verne
Project: chromium
Changelist: https://chromium.googlesource.com/chromium/src/+/1b5b587f547319a4dc72d06fc25b0494826fd9cd
Time: Wed Jun 21 01:49:57 2017
The CL last changed line 81 of file AXMenuList.cpp, which is stack frame 3. 

@Nicholas: Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

Comment 4 by nverne@chromium.org, Jul 13 2017

I suspect this is a flake. The change in question was a renaming of AXObjectImpl to AXObject. Don't know who should look.

Comment 5 by nverne@chromium.org, Jul 13 2017

Owner: dmazz...@chromium.org
Dominic, any idea what might be happening here?
Labels: triage-dominic
Blocking: 688085
Labels: -triage-dominic
Owner: aboxhall@chromium.org
Seems related to 688085, note that https://codereview.chromium.org/2939933002 ("Only call TextChanged on existing AXObjects.") is in the blamelist

Project Member

Comment 8 by ClusterFuzz, Oct 1 2017

Labels: Test-Predator-AutoComponents
Automatically applying components based on information from OWNERS files. If this seems incorrect, please apply the Test-Predator-Wrong-Components label.

Comment 9 by tzik@chromium.org, Oct 10 2017

Cc: tzik@chromium.org kochi@chromium.org
 Issue 772898  has been merged into this issue.
Project Member

Comment 10 by ClusterFuzz, Nov 7 2017

Labels: OS-Windows
Labels: -Test-Predator-AutoComponents Test-Predator-Auto-Components
Project Member

Comment 12 by ClusterFuzz, Nov 18 2017

Labels: ClusterFuzz-Verified
Status: Verified (was: Assigned)
ClusterFuzz testcase 5661748119207936 is verified as fixed, so closing issue as verified.

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

Comment 13 by ClusterFuzz, Nov 18 2017

ClusterFuzz has detected this issue as fixed in range 514498:517702.

Detailed report: https://clusterfuzz.com/testcase?key=5801145229639680

Fuzzer: inferno_layout_test_unmodified
Job Type: mac_asan_content_shell
Platform Id: mac

Crash Type: Null-dereference READ
Crash Address: 0x0000000000a8
Crash State:
  blink::AXObjectCacheImpl::GetOrCreateAXID
  blink::AXObjectCacheImpl::GetOrCreate
  blink::AXMenuList::AddChildren
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=480776:480824
Fixed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=514498:517702

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5801145229639680

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.
Labels: win-a11y

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