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/+/e7316d0c2c1a3ea146197778d926502c9646e4bf (Prefer walking the LayoutTreeBuilder tree when building the Accessibility tree.).

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.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3681121fd387b017483102bfc3b17b8547bdd6fc

commit 3681121fd387b017483102bfc3b17b8547bdd6fc
Author: Alice Boxhall <aboxhall@chromium.org>
Date: Tue Nov 20 05:20:15 2018

null check for AXObject for selectedOptions

This is showing up as a crash in AXNodeObject::TextAlternative(), which calls ComputedName() on each <option>'s accessibleNode.

Bug:  905091 
Change-Id: Ib3139b08e46eacd51a9f3e1cc6e376d9b6ab3d5d
Reviewed-on: https://chromium-review.googlesource.com/c/1343398
Commit-Queue: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609602}
[modify] https://crrev.com/3681121fd387b017483102bfc3b17b8547bdd6fc/third_party/blink/renderer/modules/accessibility/ax_node_object.cc

ClusterFuzz has detected this issue as fixed in range 609601:609602.

Detailed report: https://clusterfuzz.com/testcase?key=6252135123255296

Fuzzer: inferno_twister
Job Type: linux_asan_content_shell_drt
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  blink::AXObject::ComputedName
  blink::AXNodeObject::TextAlternative
  blink::AXLayoutObject::TextAlternative
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_content_shell_drt&range=607151:607152
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_content_shell_drt&range=609601:609602

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6252135123255296

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 6252135123255296 is verified as fixed, so closing issue as verified.

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