[Poppler-bugs] [Bug 64967] New: pdfinfo hangs when a corrupt file is piped in via stdin

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64967

          Priority: medium
            Bug ID: 64967
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: pdfinfo hangs when a corrupt file is piped in via
                    stdin
          Severity: major
    Classification: Unclassified
                OS: Mac OS X (All)
          Reporter: nathan at storydesk.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: utils
           Product: poppler

Created attachment 79774
  --> https://bugs.freedesktop.org/attachment.cgi?id=79774&action=edit
A bad PDF file

When pdfinfo receives a corrupt file that is piped in via stdin it hangs with
100% CPU usage.

Example Usage:

cat damaged.pdf | pdfinfo -

Output:

Syntax Warning: May not be a PDF file (continuing anyway)

Expected outcome:

The program should terminate after determining that the file is corrupt

Actual outcome:

After outputting the one error message it never terminates and sits there using
100% of the CPU.

It is worth noting that when pdfinfo is invoked with the exact same file via:

pdfinfo damaged.pdf

instead of piping the corrupt PDF in via stdin then this problem does not
happen and the output is:

Syntax Warning: May not be a PDF file (continuing anyway)
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Couldn't read xref table

Then the process terminates as expected.

I have attached the bad file that I am using to test with and recreate this
issue.

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