[Bug ld/20241] plugin lto + archive: invalid read access might cause SIGSEGV

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20241

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2016-06-12
           Assignee|unassigned at sourceware dot org   |amodra at gmail dot com
     Ever confirmed|0                           |1

--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
It looks like the invalid reads are all due to the bfd_close in
plugin_maybe_claim which frees bfd->filename and the bfd itself.
add_archive_element keeps pointers to the_bfd and the_bfd->filename in a
lang_input_statement_type linker script statement, which are then accessed in
script traversals.  my_archive is *not* set for thin archives..

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