[Poppler-bugs] [Bug 94873] New: [PATCH] Segfault on certain PDF form item activation actions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94873

            Bug ID: 94873
           Summary: [PATCH] Segfault on certain PDF form item activation
                    actions
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: qt4 frontend
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: arseniy at alumni.chalmers.se

Created attachment 122824
  --> https://bugs.freedesktop.org/attachment.cgi?id=122824&action=edit
The patch

PageData::convertLinkActionToLink in qt4/src/poppler-page.cc, for
actionRendition link kind, calls copy() on LinkRendition::getMedia(). However,
LinkRendition constructor from Poppler core has several ways to leave the media
field at NULL. The situation I came across was operationCode = 5, but it looks
like the same would happen for 1 ≤ operationCode ≤ 3 and missing R field, which
isn't even considered an malformed PDF.

Anyway, I'm attaching a patch that fixes the segfault when
LinkRendition::getMedia() returns NULL for whatever reason. I'm not attaching
the test case because it's 150 MB large and copyrighted but I guess I can send
it privately to someone if really needed.

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