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Issue 842493 link

Starred by 3 users
Status: Untriaged
Owner: ----
Cc:
robertph...@google.com
mtklein@chromium.org
mbarbe...@chromium.org
reed@google.com
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 2
Type: Bug



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Integer-overflow in computeAlphaBelowLine

Project Member Reported by ClusterFuzz, May 13 2018 
Detailed report: https://clusterfuzz.com/testcase?key=6257133700775936

Fuzzer: libFuzzer_skia_path_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Integer-overflow
Crash Address: 
Crash State:
  computeAlphaBelowLine
  blit_aaa_trapezoid_row
  aaa_walk_edges
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=479170:479259

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6257133700775936

Issue filed automatically.

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

Comment 1 by ClusterFuzz, May 13 2018

Components: Internals>Skia
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, May 13 2018

Cc: mbarbe...@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, May 13 2018

Cc: mtklein@chromium.org robertph...@google.com reed@google.com
Labels: Test-Predator-Auto-CC
Automatically adding ccs based on suspected regression changelists:

use pipeline for non-opt xfermodes by reed@google.com - https://skia.googlesource.com/skia/+/e93cf97175d348ce1400762bdd8d9acabdd29766

Revert "use pipeline for non-opt xfermodes" by mtklein@chromium.org - https://skia.googlesource.com/skia/+/4f8c695736c8ae4fed2190a8e1301a4f4a979898

Retract GrTexture*.h & GrRenderTarget*.h from other headers by robertphillips@google.com - https://skia.googlesource.com/skia/+/646e4293f06d9de6d44dbfa3c32cdc15a6f5906e

If this is incorrect, please let us know why and apply the Test-Predator-Wrong-CLs label.
Project Member

Comment 4 by ClusterFuzz, Dec 1

Labels: -Reproducible Unreproducible
ClusterFuzz testcase 6257133700775936 appears to be flaky, updating reproducibility label.

Comment 5 by infe...@chromium.org, Dec 1

Labels: -Unreproducible Reproducible
Please ignore the last comment about testcase being unreproducible. The testcase is still reproducible. This happened due to a code refactoring on ClusterFuzz side, and the underlying root cause is now fixed. Resetting the label back to Reproducible. Sorry about the inconvenience caused from these incorrect notifications.

Comment 6 by infe...@chromium.org, Dec 1 

Please ignore the last comment about testcase being unreproducible. The testcase is still reproducible. This happened due to a code refactoring on ClusterFuzz side, and the underlying root cause is now fixed. Resetting the label back to Reproducible. Sorry about the inconvenience caused from these incorrect notifications.
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