re PR c/70852 (ice in warn_for_memset)

	PR c/70852
	* c-common.c (warn_for_memset): Check domain before accessing it.

	* gcc.dg/pr70852.c: New test.

From-SVN: r235638

gcc/c-family/ChangeLog

+2016-04-29  Marek Polacek  <polacek@redhat.com>
+
+	PR c/70852
+	* c-common.c (warn_for_memset): Check domain before accessing it.
+
 2016-04-29  Dominik Vogt  <vogt@linux.vnet.ibm.com>
 
 	PR/69089

gcc/c-family/c-common.c

@@ -11796,6 +11796,7 @@ warn_for_memset (location_t loc, tree arg0, tree arg2,
 	  tree elt_type = TREE_TYPE (type);
 	  tree domain = TYPE_DOMAIN (type);
 	  if (!integer_onep (TYPE_SIZE_UNIT (elt_type))
+	      && domain != NULL_TREE
 	      && TYPE_MAXVAL (domain)
 	      && TYPE_MINVAL (domain)
 	      && integer_zerop (TYPE_MINVAL (domain))

gcc/testsuite/ChangeLog

@@ -3,6 +3,9 @@
 	PR sanitizer/70342
 	* g++.dg/ubsan/null-7.C: New test.
 
+	PR c/70852
+	* gcc.dg/pr70852.c: New test.
+
 2016-04-29  Dominik Vogt  <vogt@linux.vnet.ibm.com>
 
 	PR/69089

gcc/testsuite/gcc.dg/pr70852.c

+/* PR c/70852 */
+/* { dg-do compile } */
+/* { dg-options "-Wall" } */
+
+extern void *memset (void *, int, __SIZE_TYPE__);
+extern int A[];
+void
+fn1 (void)
+{
+  memset (A, 0, 1);
+}