[screen-devel] [bug #45714] read access violation in MWrapChar()

[Kuang-che Wu]

URL:
  <http://savannah.gnu.org/bugs/?45714>

                 Summary: read access violation in MWrapChar()
                 Project: GNU Screen
            Submitted by: kcwu
            Submitted on: Fri 07 Aug 2015 02:07:13 PM GMT
                Category: Crash/Freeze/Infloop
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
           Fixed Release: None
         Planned Release: None
           Work Required: None

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Details:

How to reproduce
$ screen -D -m printf '\x1b[8;;1t\xe3\x80\xb4\x1b[P'

It crashed inside MWrapChar() with y=-1
at line
  copy_mchar2mline(&mchar_null, ml, p->w_width);
which access to ml->image but ml is invalid due to
  ml = &p->w_mlines[y];





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