[Bug gas/20896] AS: Buffer Overflow when expanding .irp directives

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20896

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-12-05
                 CC|                            |amodra at gmail dot com
     Ever confirmed|0                           |1

--- Comment #3 from Alan Modra <amodra at gmail dot com> ---
The problem is that next_char_of_string() only returns NOT_A_CHAR for '\"'. 
NOT_A_CHAR is tested by is_a_char() in demand_copy_string() to determine the
end of string.  A NUL is not seen as the end of string..  ie.
demand_copy_string() can merrily read off the end of input.

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