This is a serious security regression. If you are not able to fix this quickly, please revert the change that introduced it.

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

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jvanverth@ -- can you please help triage this. The regression range is useless.

My suspicion is that this is related to  bug 749472 . I'll take a look.

The following revision refers to this bug:
  https://skia.googlesource.com/skia/+/1380bb47ab14569a0c1920ae7367fb4360b92bb8

commit 1380bb47ab14569a0c1920ae7367fb4360b92bb8
Author: Jim Van Verth <jvanverth@google.com>
Date: Mon Jul 31 18:55:12 2017

Don't draw text with zero glyph counts as paths

Bug:  chromium:750420 
Change-Id: Ie1a62356a3263c440a94ba1fd637c12884465515
Reviewed-on: https://skia-review.googlesource.com/28862
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>

[modify] https://crrev.com/1380bb47ab14569a0c1920ae7367fb4360b92bb8/src/gpu/text/GrTextUtils.cpp

ClusterFuzz has detected this issue as fixed in range 490999:491077.

Detailed report: https://clusterfuzz.com/testcase?key=5246363599372288

Fuzzer: afl_paint_op_buffer_fuzzer
Job Type: afl_chrome_asan
Platform Id: linux

Crash Type: Heap-buffer-overflow READ 4
Crash Address: 0x6140000001f8
Crash State:
  GrTextUtils::DrawPosTextAsPath
  GrAtlasTextContext::drawPosText
  GrRenderTargetContext::drawPosText
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=489460:489535
Fixed: https://clusterfuzz.com/revisions?job=afl_chrome_asan&range=490999:491077

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5246363599372288


See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md 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 5246363599372288 is verified as fixed, so closing issue as verified.

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

This bug requires manual review: M62 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), bhthompson@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Already in M62

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot