c-ubsan.c (ubsan_instrument_bounds): Don't instrument if TYPE_MAX_VALUE is NULL.

	* c-ubsan.c (ubsan_instrument_bounds): Don't instrument if
	TYPE_MAX_VALUE is NULL.

	* gcc.dg/ubsan/bounds-1.c: New test.

From-SVN: r212552

gcc/c-family/ChangeLog

+2014-07-15  Marek Polacek  <polacek@redhat.com>
+
+	* c-ubsan.c (ubsan_instrument_bounds): Don't instrument if
+	TYPE_MAX_VALUE is NULL.
+
 2014-07-14  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/61294

gcc/c-family/c-ubsan.c

@@ -265,7 +265,7 @@ ubsan_instrument_bounds (location_t loc, tree array, tree *index,
   tree type = TREE_TYPE (array);
   tree domain = TYPE_DOMAIN (type);
 
-  if (domain == NULL_TREE)
+  if (domain == NULL_TREE || TYPE_MAX_VALUE (domain) == NULL_TREE)
     return NULL_TREE;
 
   tree bound = TYPE_MAX_VALUE (domain);

gcc/testsuite/ChangeLog

+2014-07-15  Marek Polacek  <polacek@redhat.com>
+
+	* gcc.dg/ubsan/bounds-1.c: New test.
+
 2014-06-15  Tobias Burnus  <burnus@net-b.de>
 
 	* gfortran.dg/coarray_34.f90: New.

gcc/testsuite/gcc.dg/ubsan/bounds-1.c

+/* { dg-do compile } */
+/* { dg-options "-fsanitize=bounds" } */
+
+struct T { int c; char d[]; } t = { 1, "abcdefg" };
+
+int
+baz (int i)
+{
+  return t.d[i];
+}