Merge to XFA: Fix an infinite loop parsing in CPDF_SyntaxParser::GetObject()

Merge to XFA: Fix an infinite loop parsing in CPDF_SyntaxParser::GetObject()

CPDF_SyntaxParser::GetObject() may enter into an infinite loop when a
signature dictionary doesn't have 'Contents' field. Add a check to
avoid that.

BUG=pdfium:344
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1575833004 .

(cherry picked from commit d3ab0f383f6736657480a8bb418c5e715a1aed3b)

Committed: https://pdfium.googlesource.com/pdfium/+/f2b300af96e05bb372664752a64f6ab506820a12

[Wei Li, 2016-01-11 22:15:48]

Clean merge, TBR

[Wei Li, 2016-01-11 22:16:14]

Description was changed from

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Merge to XFA: Fix an infinite loop parsing in CPDF_SyntaxParser::GetObject()

CPDF_SyntaxParser::GetObject() may enter into an infinite loop when a
signature dictionary doesn't have 'Contents' field. Add a check to
avoid that.

BUG=pdfium:344
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1575833004 .

(cherry picked from commit d3ab0f383f6736657480a8bb418c5e715a1aed3b)
==========

to

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Merge to XFA: Fix an infinite loop parsing in CPDF_SyntaxParser::GetObject()

CPDF_SyntaxParser::GetObject() may enter into an infinite loop when a
signature dictionary doesn't have 'Contents' field. Add a check to
avoid that.

BUG=pdfium:344
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1575833004 .

(cherry picked from commit d3ab0f383f6736657480a8bb418c5e715a1aed3b)

Committed:
https://pdfium.googlesource.com/pdfium/+/f2b300af96e05bb372664752a64f6ab50682...
==========

[Wei Li, 2016-01-11 22:16:15]

Committed patchset #1 (id:1) manually as
f2b300af96e05bb372664752a64f6ab506820a12 (presubmit successful).

[Lei Zhang, 2016-01-11 22:53:17]

lgtm