The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0cfacc551f44e0f9d85ea50c86005ed847b2cc55

commit 0cfacc551f44e0f9d85ea50c86005ed847b2cc55
Author: Vladimir Levin <vmpstr@chromium.org>
Date: Sun Nov 12 07:16:58 2017

cc/paint: Validate SkData for text blob deserialization.

This patch verifies that the SkData we use to deserialize a text blob
looks correct (and will not cause an assert in Skia).

R=enne@chromium.org

Bug:  783808 ,  783815 ,  783828 
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ib07666354827a70dd4a95a589c60ab12b5e61ae7
Reviewed-on: https://chromium-review.googlesource.com/764582
Commit-Queue: enne <enne@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515862}
[modify] https://crrev.com/0cfacc551f44e0f9d85ea50c86005ed847b2cc55/cc/paint/paint_op_reader.cc

ClusterFuzz has detected this issue as fixed in range 515861:515862.

Detailed report: https://clusterfuzz.com/testcase?key=6011164436987904

Fuzzer: libFuzzer_paint_op_buffer_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  SkReadBuffer::readRect
  SkTextBlob::MakeFromBuffer
  SkTextBlob::Deserialize
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=514197:514231
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=515861:515862

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6011164436987904

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.

ClusterFuzz testcase 6011164436987904 is verified as fixed, so closing issue as verified.

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