re PR sanitizer/79558 (ICE: Segfault in ubsan_type_descriptor, at ubsan.c:412)

	PR sanitizer/79558
	* ubsan.c (ubsan_type_descriptor): Check if TYPE_MAX_VALUE is null.

	* c-c++-common/ubsan/bounds-14.c: New test.

From-SVN: r245605

gcc/ChangeLog

@@ -3,6 +3,9 @@
 	PR middle-end/79537
 	* gimplify.c (gimplify_expr): Handle unused *&&L;.
 
+	PR sanitizer/79558
+	* ubsan.c (ubsan_type_descriptor): Check if TYPE_MAX_VALUE is null.
+
 2017-02-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/79568

gcc/testsuite/ChangeLog

@@ -3,6 +3,9 @@
 	PR middle-end/79537
 	* gcc.dg/comp-goto-4.c: New test.
 
+	PR sanitizer/79558
+	* c-c++-common/ubsan/bounds-14.c: New test.
+
 2017-02-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/79568

gcc/testsuite/c-c++-common/ubsan/bounds-14.c

+/* PR sanitizer/79558 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=bounds" } */
+
+void
+fn1 (int n)
+{
+  int i, j;
+  int x[2][0];
+  for (i = 0; i < n; i++)
+    for (j = 0; j < n; j++)
+      x[i][j] = 5;
+}

gcc/ubsan.c

@@ -409,7 +409,9 @@ ubsan_type_descriptor (tree type, enum ubsan_print_style pstyle)
 	{
 	  pp_left_bracket (&pretty_name);
 	  tree dom = TYPE_DOMAIN (t);
-	  if (dom && TREE_CODE (TYPE_MAX_VALUE (dom)) == INTEGER_CST)
+	  if (dom != NULL_TREE
+	      && TYPE_MAX_VALUE (dom) != NULL_TREE
+	      && TREE_CODE (TYPE_MAX_VALUE (dom)) == INTEGER_CST)
 	    {
 	      if (tree_fits_uhwi_p (TYPE_MAX_VALUE (dom))
 		  && tree_to_uhwi (TYPE_MAX_VALUE (dom)) + 1 != 0)