PR gdb/15827

PR gdb/15827

Install some sanity checks that sibling DIE offsets are not beyond the
defined limits of the DWARF input buffer in read_partial_die and skip_one_die.

2014-03-20  Keith Seitz  <keiths@redhat.com>

	PR gdb/15827
	* dwarf2read.c (skip_one_die): Check that all relative-offset
	sibling DIEs fall within range of the current reader's buffer.
	(read_partial_die): Likewise.

2014-03-20  Keith Seitz  <keiths@redhat.com>

	PR gdb/15827
	* gdb.dwarf2/corrupt.c: New file.
	* gdb.dwarf2/corrupt.exp: New file.