PR22201, DW_AT_name with out of bounds reference

[Alan Modra]

DW_AT_name ought to always have a string value.

	PR 22201
	* dwarf2.c (scan_unit_for_symbols): Ignore DW_AT_name unless it
	has string form.
	(parse_comp_unit): Likewise.

diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index 8abb3f0..9ae5fba 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -3225,7 +3225,8 @@ scan_unit_for_symbols (struct comp_unit *unit)
 	      switch (attr.name)
 		{
 		case DW_AT_name:
-		  var->name = attr.u.str;
+		  if (is_str_attr (attr.form))
+		    var->name = attr.u.str;
 		  break;
 
 		case DW_AT_decl_file:
@@ -3477,7 +3478,8 @@ parse_comp_unit (struct dwarf2_debug *stash,
 	  break;
 
 	case DW_AT_name:
-	  unit->name = attr.u.str;
+	  if (is_str_attr (attr.form))
+	    unit->name = attr.u.str;
 	  break;
 
 	case DW_AT_low_pc:

-- 
Alan Modra
Australia Development Lab, IBM