PR28048, heap-buffer-overflow on readelf -Ww

PR 28048
	* dwarf.c (get_type_signedness): Don't run off end of buffer
	printing DW_FORM_string attribute.

binutils/ChangeLog

@@ -1,3 +1,9 @@
+2021-07-02  Alan Modra  <amodra@gmail.com>
+
+	PR 28048
+	* dwarf.c (get_type_signedness): Don't run off end of buffer
+	printing DW_FORM_string attribute.
+
 2021-07-01  Nick Clifton  <nickc@redhat.com>
 
 	PR 28029

binutils/dwarf.c

@@ -2211,7 +2211,7 @@ get_type_signedness (abbrev_entry *entry,
 	      if (attr->form == DW_FORM_strp)
 		printf (", %s", fetch_indirect_string (uvalue));
 	      else if (attr->form == DW_FORM_string)
-		printf (", %s", orig_data);
+		printf (", %.*s", (int) (end - orig_data), orig_data);
 	    }
 	  break;