Fix ld uninitialized read of script ASSERT data structure

lang_assignment_statement serves both assignments and asserts.

	* ldlang.c (open_input_bfds): Check that lang_assignment_statement
	is not an assert before referencing defsym.

diff --git a/ld/ChangeLog b/ld/ChangeLog
index cbe44a2..3883bcb 100644 (file)
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,8 @@
+2017-03-07  Alan Modra  <amodra@gmail.com>
+
+       * ldlang.c (open_input_bfds): Check that lang_assignment_statement
+       is not an assert before referencing defsym.
+
 2017-03-05  Alan Modra  <amodra@gmail.com>
 
        * testsuite/ld-elf/eh3.d: Adjust for eh_frame alignment change.

diff --git a/ld/ldlang.c b/ld/ldlang.c
index 1396c5b..ff6ef39 100644 (file)
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -3374,7 +3374,8 @@ open_input_bfds (lang_statement_union_type *s, enum open_bfd_mode mode)
 #endif
          break;
        case lang_assignment_statement_enum:
-         if (s->assignment_statement.exp->assign.defsym)
+         if (s->assignment_statement.exp->type.node_class != etree_assert
+             && s->assignment_statement.exp->assign.defsym)
            /* This is from a --defsym on the command line.  */
            exp_fold_tree_no_dot (s->assignment_statement.exp);
          break;