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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 size

Project Member Reported by ClusterFuzz, Apr 1 2018

Issue description

Detailed report: https://clusterfuzz.com/testcase?key=6507565207519232

Fuzzer: afl_gpu_swiftshader_fuzzer
Job Type: afl_chrome_asan
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000018
Crash State:
  size
  bool es2::Context::getIntegerv<int>
  es2::GetIntegerv
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=539214:539235

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6507565207519232

Issue filed automatically.

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

Comment 1 by ClusterFuzz, Apr 1 2018

Components: Internals>GPU>SwiftShader
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, Apr 1 2018

Labels: Test-Predator-Auto-Owner
Owner: enne@chromium.org
Status: Assigned (was: Untriaged)
Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/27a33c6510b49dda52c27035e4b580738b653a0f (Remove gpu workaround code that no config specifies).

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 enne@chromium.org, Apr 2 2018

Cc: enne@chromium.org
Owner: capn@chromium.org
More that seem similar to https://bugs.chromium.org/p/chromium/issues/detail?id=825545#c8.  Reassigning.

Comment 4 by capn@chromium.org, Apr 4 2018

Cc: mmoroz@chromium.org capn@chromium.org
Owner: sugoi@chromium.org
It looks like ClusterFuzz is assigning these issues incorrectly, or I'm missing a change in the regression range that triggered this.

Anyway, for this bug there's simply a missing null pointer check. Alexis, can you take this?

Comment 5 by enne@chromium.org, Apr 4 2018

I think these are technically correct, in the sense that clusterfuzz finds an issue, and then bisects to find an owner.  I'm guessing that because I changed the workaround ordering, then the issue doesn't repro before my change and breaks after my change, so therefore my change is the culprit.
Project Member

Comment 6 by ClusterFuzz, May 17 2018

ClusterFuzz has detected this issue as fixed in range 559054:559064.

Detailed report: https://clusterfuzz.com/testcase?key=6507565207519232

Fuzzer: afl_gpu_swiftshader_fuzzer
Job Type: afl_chrome_asan
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000018
Crash State:
  size
  bool es2::Context::getIntegerv<int>
  es2::GetIntegerv
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=539214:539235
Fixed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=559054:559064

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6507565207519232

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md 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 7 by ClusterFuzz, May 17 2018

Labels: ClusterFuzz-Verified
Status: Verified (was: Assigned)
ClusterFuzz testcase 6507565207519232 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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