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

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mkwst: is there someone on your team who can pick up these permissions bugs? I'm happy to help give advice on the fixes.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/47df4b2c0b9dd21416767c0b31a824435a75e9b1

commit 47df4b2c0b9dd21416767c0b31a824435a75e9b1
Author: Raymes Khoury <raymes@chromium.org>
Date: Thu May 10 04:30:17 2018

Fix 2 nullptr dereferences in permissions code

This fixes 2 nullptr dereferences. The first arises because we don't
sanity check the permission type received in the PermissionService. We
don't expect to receive protected media requests on non-android
platforms so a check is added for that.

The second is because the default implementation of ResetPermission in
PermissionContextBase won't work for content settings types which don't
have a registered ContentSettingsType. We add a check for that case
before resetting the permission.

Bug:  839194 ,  839221 
Change-Id: I0dbb9930a7cc5e459b99e8f937791846fd0db83b
Reviewed-on: https://chromium-review.googlesource.com/1045962
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Raymes Khoury <raymes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557450}
[modify] https://crrev.com/47df4b2c0b9dd21416767c0b31a824435a75e9b1/chrome/browser/permissions/permission_context_base.cc
[modify] https://crrev.com/47df4b2c0b9dd21416767c0b31a824435a75e9b1/content/browser/bad_message.h
[modify] https://crrev.com/47df4b2c0b9dd21416767c0b31a824435a75e9b1/content/browser/permissions/permission_service_context.h
[modify] https://crrev.com/47df4b2c0b9dd21416767c0b31a824435a75e9b1/content/browser/permissions/permission_service_impl.cc
[modify] https://crrev.com/47df4b2c0b9dd21416767c0b31a824435a75e9b1/content/browser/permissions/permission_service_impl.h
[modify] https://crrev.com/47df4b2c0b9dd21416767c0b31a824435a75e9b1/tools/metrics/histograms/enums.xml

ClusterFuzz has detected this issue as fixed in range 557449:557450.

Detailed report: https://clusterfuzz.com/testcase?key=5357850025787392

Fuzzer: mojo_fuzzer
Job Type: linux_asan_chrome_mojo
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000060
Crash State:
  GetPatternsForContentSettingsType
  HostContentSettingsMap::SetContentSettingDefaultScope
  PermissionContextBase::ResetPermission
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_mojo&range=555295:555297
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_mojo&range=557449:557450

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5357850025787392

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 5357850025787392 is verified as fixed, so closing issue as verified.

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