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Issue 859354 link

Starred by 2 users
Status: Duplicate
Merged: issue 734334
Owner:
█ dominicc@chromium.org
Last visit > 30 days ago
Closed: Sep 21
Cc:
█ aizatsky@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 2
Type: Bug



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Null-dereference READ in content::WebURLLoaderImpl::Context::Start

Project Member Reported by ClusterFuzz, Jul 1 
Detailed report: https://clusterfuzz.com/testcase?key=4569230306181120

Fuzzer: libFuzzer_renderer_fuzzer
Job Type: libfuzzer_chrome_msan
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  content::WebURLLoaderImpl::Context::Start
  content::WebURLLoaderImpl::LoadSynchronously
  blink::ResourceLoader::RequestSynchronously
  
Sanitizer: memory (MSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_msan&range=530794:530795

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4569230306181120

Issue filed automatically.

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.
Project Member

Comment 1 by ClusterFuzz, Jul 1

Components: Blink>Loader Internals>Core
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, Jul 1

Cc: aizatsky@chromium.org
Labels: ClusterFuzz-Auto-CC
Automatically adding ccs based on OWNERS file / target commit history.

If this is incorrect, please add ClusterFuzz-Wrong label.
Project Member

Comment 3 by ClusterFuzz, Jul 1

Labels: Test-Predator-Auto-Owner
Owner: peria@chromium.org
Status: Assigned (was: Untriaged)
Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/8b6254d72354e61e9976d1b0817477689ec9eec7 (bindings: Enable V8ContextSnasphot on fuzzers).

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 4 by peria@chromium.org, Jul 1

Labels: -Pri-1 Pri-2

Comment 5 by dominicc@chromium.org, Sep 6

Owner: dominicc@chromium.org
This is happening because the fuzzer uses a unit test WebURLLoaderFactory with a null resource dispatcher.

I have a patch to return early with an error here, but I'm currently jumping through CLA hoops before I can upload it.

Comment 6 by dominicc@chromium.org, Sep 12

Status: Started (was: Assigned)
Patch up at https://chromium-review.googlesource.com/c/chromium/src/+/1220870

Comment 7 by dominicc@chromium.org, Sep 21

Mergedinto: 734334
Status: Duplicate (was: Started)
Project Member

Comment 8 by ClusterFuzz, Dec 1

Labels: -Reproducible Unreproducible
ClusterFuzz testcase 4569230306181120 appears to be flaky, updating reproducibility label.
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