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[bug #32255] info crashes if # of rows is very small

From: Hilmar Preusse
Subject: [bug #32255] info crashes if # of rows is very small
Date: Fri, 28 Jan 2011 12:52:23 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv: Gecko/20101203 Firefox/3.6.13 ( .NET CLR 3.5.30729; .NET4.0E)


                 Summary: info crashes if # of rows is very small
                 Project: texinfo - GNU documentation system
            Submitted by: hpreusse
            Submitted on: Wed 26 Jan 2011 03:59:07 PM GMT
                Category: info
                 Release: 4.13a
                Priority: 5 - Normal
                Severity: 3 - Normal
              Item Group: bug
                 Privacy: Public
             Open/Closed: Open
             Assigned to: None
         Discussion Lock: Any
                  Status: None



We got a bug report down here in the DBTS: http://bugs.debian.org/611151

This bug is easy to reproduce.  Simply run "info" in a terminal, then resize
the terminal to have a height smaller than 6.  The info program immediately
exits with a segmentation fault.

The problem is that window.c:window_line_of_point() can return a negative
index. A simple fix is to sanity check the output (patch

That patch will prevent segmentation faults, but there is still something
wrong with the arithmetic, probably in window_new_screen_size() which is a
mess.  Shrinking and enlarging the buffer repeatedly leaves a gap, but that's
the subject for another bug.

The submitter provided a patch, which can be found in the bug report (not
tested by me).


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