Another XFA issue.

The following revision refers to this bug:
  https://pdfium.googlesource.com/pdfium/+/c4722a7a3b3274fb066c2aac4eb3717e648b3004

commit c4722a7a3b3274fb066c2aac4eb3717e648b3004
Author: Nicolas Pena <npm@chromium.org>
Date: Mon May 15 19:10:54 2017

Libtiff: upstream fix for heap buffer overflow

Upstream patch:
https://github.com/vadz/libtiff/commit/5a4eceed8d2f28d05f49add9ce647684d59d461a

Bug:  chromium:722071 
Change-Id: Idef412edbeb3255375ab18c68721dbaf7c601119
Reviewed-on: https://pdfium-review.googlesource.com/5511
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

[modify] https://crrev.com/c4722a7a3b3274fb066c2aac4eb3717e648b3004/third_party/libtiff/tif_packbits.c
[modify] https://crrev.com/c4722a7a3b3274fb066c2aac4eb3717e648b3004/third_party/libtiff/README.pdfium
[add] https://crrev.com/c4722a7a3b3274fb066c2aac4eb3717e648b3004/third_party/libtiff/0024-upstream-PackBitsDecode-fix.patch

ClusterFuzz has detected this issue as fixed in range 472038:472050.

Detailed report: https://clusterfuzz.com/testcase?key=6221533432512512

Fuzzer: libfuzzer_pdf_codec_tiff_fuzzer
Job Type: mac_libfuzzer_chrome_asan
Platform Id: mac

Crash Type: Heap-buffer-overflow READ 1
Crash Address: 0x619000002c80
Crash State:
  PackBitsDecode
  TIFFReadEncodedStrip
  gtStripContig
  
Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=mac_libfuzzer_chrome_asan&range=422955:422985
Fixed: https://clusterfuzz.com/revisions?job=mac_libfuzzer_chrome_asan&range=472038:472050

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6221533432512512


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 6221533432512512 is verified as fixed, so closing issue.

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

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