sparc64 segfault in finish_dynamic_symbol

[Alan Modra]

SYMBOL_REFERENCES_LOCAL can return true for undefined symbols.  This
can result in a segfault when running sparc64 ld/testsuite/ld-vsb
tests that expect a failure.

	* elfxx-sparc.c (_bfd_sparc_elf_finish_dynamic_symbol): Don't
	access u.def.section on non-default visibility undefined symbol.

diff --git a/bfd/elfxx-sparc.c b/bfd/elfxx-sparc.c
index 618b88589c7..514db1e4c76 100644
--- a/bfd/elfxx-sparc.c
+++ b/bfd/elfxx-sparc.c
@@ -4416,7 +4416,10 @@ _bfd_sparc_elf_finish_dynamic_symbol (bfd *output_bfd,
 	  return true;
 	}
 
-      if (bfd_link_pic (info) && SYMBOL_REFERENCES_LOCAL (info, h))
+      if (bfd_link_pic (info)
+	  && (h->root.type == bfd_link_hash_defined
+	      || h->root.type == bfd_link_hash_defweak)
+	  && SYMBOL_REFERENCES_LOCAL (info, h))
 	{
 	  asection *sec = h->root.u.def.section;
 	  if (h->type == STT_GNU_IFUNC)

-- 
Alan Modra
Australia Development Lab, IBM