[Poppler-bugs] [Bug 16770] support for digital signatures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=16770

--- Comment #105 from Andre Guerreiro <aguerreiro1985 at gmail.com> ---
Created attachment 120434
  --> https://bugs.freedesktop.org/attachment.cgi?id=120434&action=edit
Improve robustness of SignatureHandler::validateCertificate

This patch adds additional NULL-checking in
SignatureHandler::validateCertificate() which avoids segfault for some
signatures like the one contained here:
http://www.gpo.gov/fdsys/pkg/BUDGET-2015-BUD/pdf/BUDGET-2015-BUD.pdf

It also removes a useless branch in validateCertificate()

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