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The following revision refers to this bug:
  https://pdfium.googlesource.com/pdfium/+/04d792fb7510e328f508bc81379ca15791af93e7

commit 04d792fb7510e328f508bc81379ca15791af93e7
Author: Dan Sinclair <dsinclair@chromium.org>
Date: Wed Mar 07 20:44:47 2018

[formcalc] Consider width along with depth of tree

When building the formcalc parser trees we need to limit on width along
with depth. It's possible to generate a tree of a single depth but is
more then 20k nodes wide. This will eventuall cause stack overflow
issues.

This CL re-uses the depth check for the grammar expressions in which
we're extending the width of the tree we count that against our depth
check.

Bug:  chromium:813346 
Change-Id: I01f6567a75776a75374465eacc1ff546db46cac1
Reviewed-on: https://pdfium-review.googlesource.com/28170
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

[modify] https://crrev.com/04d792fb7510e328f508bc81379ca15791af93e7/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp
[modify] https://crrev.com/04d792fb7510e328f508bc81379ca15791af93e7/xfa/fxfa/fm2js/cxfa_fmparser.cpp

ClusterFuzz has detected this issue as fixed in range 541704:541715.

Detailed report: https://clusterfuzz.com/testcase?key=4586778345603072

Fuzzer: libFuzzer_pdf_formcalc_fuzzer
Job Type: libfuzzer_chrome_asan_debug
Platform Id: linux

Crash Type: Stack-overflow
Crash Address: 0x7fff70bf6fe0
Crash State:
  CXFA_FMBinExpression::~CXFA_FMBinExpression
  CXFA_FMEqualityExpression::~CXFA_FMEqualityExpression
  CXFA_FMEqualityExpression::~CXFA_FMEqualityExpression
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=510527:510556
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=541704:541715

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4586778345603072

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 4586778345603072 is verified as fixed, so closing issue as verified.

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