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Issue metadata

Status: Verified
Owner:
Closed: Jul 28
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 1
Type: Bug



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Null-dereference READ in SkWriter32::writeRect

Project Member Reported by ClusterFuzz, Jul 3

Issue description

Detailed report: https://clusterfuzz.com/testcase?key=6031477423472640

Fuzzer: afl_paint_op_buffer_eq_fuzzer
Job Type: afl_chrome_asan
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000004
Crash State:
  SkWriter32::writeRect
  SkTextBlob::flatten
  SkTextBlob::serialize
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=548598:548610

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6031477423472640

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 3

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, Jul 3

Cc: enne@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 3

Labels: Test-Predator-Auto-Owner
Owner: khushals...@chromium.org
Status: Assigned (was: Untriaged)
Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/c96940cb27bc403ba1d3806b26e7160b3d47133d (cc: Avoid extra allocation and copy for SkTextBlob serialization.).

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.
Project Member

Comment 4 by ClusterFuzz, Jul 28

ClusterFuzz has detected this issue as fixed in range 578890:578891.

Detailed report: https://clusterfuzz.com/testcase?key=6031477423472640

Fuzzer: afl_paint_op_buffer_eq_fuzzer
Job Type: afl_chrome_asan
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000004
Crash State:
  SkWriter32::writeRect
  SkTextBlob::flatten
  SkTextBlob::serialize
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=548598:548610
Fixed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=578890:578891

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6031477423472640

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 5 by ClusterFuzz, Jul 28

Labels: ClusterFuzz-Verified
Status: Verified (was: Assigned)
ClusterFuzz testcase 6031477423472640 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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