re PR sanitizer/81223 (ICE in instrument_null at gcc/ubsan.c:1230)

	PR sanitizer/81223
	* ubsan.c (instrument_null): Check get_base_address's result for null.

	* gcc.dg/ubsan/pr81223.c: New test.

From-SVN: r249687

gcc/ChangeLog

+2017-06-27  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/81223
+	* ubsan.c (instrument_null): Check get_base_address's result for null.
+
 2017-06-27  Marc Glisse  <marc.glisse@inria.fr>
 
 	* match.pd ((A+-B)+(C-A), (A+B)-(A-C)): New transformations.

gcc/testsuite/ChangeLog

+2017-06-27  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/81223
+	* gcc.dg/ubsan/pr81223.c: New test.
+
 2017-06-27  Marc Glisse  <marc.glisse@inria.fr>
 
 	* gcc.dg/tree-ssa/assoc-1.c: New file.

gcc/testsuite/gcc.dg/ubsan/pr81223.c

+/* PR sanitizer/81223 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=undefined" } */
+
+void bar ();
+
+void
+foo (int x)
+{
+  struct S { char a[x]; } v;
+  bar (v);
+}

gcc/ubsan.c

@@ -1228,7 +1228,8 @@ instrument_null (gimple_stmt_iterator gsi, tree t, bool is_lhs)
   if (TREE_CODE (t) == ADDR_EXPR)
     t = TREE_OPERAND (t, 0);
   tree base = get_base_address (t);
-  if (TREE_CODE (base) == MEM_REF
+  if (base != NULL_TREE
+      && TREE_CODE (base) == MEM_REF
       && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
     instrument_mem_ref (t, base, &gsi, is_lhs);
 }