re PR sanitizer/88619 (ICE in asan_emit_stack_protection, at asan.c:1574 since r266664)

	PR sanitizer/88619
	* cfgexpand.c (expand_stack_vars): Only align prev_offset to
	ASAN_MIN_RED_ZONE_SIZE, not to maximum of that and alignb.

	* c-c++-common/asan/pr88619.c: New test.

From-SVN: r267633

gcc/ChangeLog

 2019-01-07  Jakub Jelinek  <jakub@redhat.com>
 
+	PR sanitizer/88619
+	* cfgexpand.c (expand_stack_vars): Only align prev_offset to
+	ASAN_MIN_RED_ZONE_SIZE, not to maximum of that and alignb.
+
 	PR c++/85052
 	* tree-vect-generic.c: Include insn-config.h and recog.h.
 	(expand_vector_piecewise): Add defaulted ret_type argument,

gcc/cfgexpand.c

@@ -1130,7 +1130,7 @@ expand_stack_vars (bool (*pred) (size_t), struct stack_vars_data *data)
 		  prev_offset = frame_offset.to_constant ();
 		}
 	      prev_offset = align_base (prev_offset,
-					MAX (alignb, ASAN_MIN_RED_ZONE_SIZE),
+					ASAN_MIN_RED_ZONE_SIZE,
 					!FRAME_GROWS_DOWNWARD);
 	      tree repr_decl = NULL_TREE;
 	      unsigned HOST_WIDE_INT size

gcc/testsuite/ChangeLog

 2019-01-07  Jakub Jelinek  <jakub@redhat.com>
 
+	PR sanitizer/88619
+	* c-c++-common/asan/pr88619.c: New test.
+
 	PR c++/85052
 	* c-c++-common/builtin-convertvector-1.c: New test.
 	* c-c++-common/torture/builtin-convertvector-1.c: New test.

gcc/testsuite/c-c++-common/asan/pr88619.c

+/* PR sanitizer/88619 */
+/* { dg-do compile { target fstack_protector } } */
+/* { dg-options "-fstack-protector-strong -fsanitize=address" } */
+
+typedef int A __attribute__((aligned (64)));
+
+int
+main ()
+{
+  A b;
+  int *p = &b;
+  *(p - 1) = 123;
+  __builtin_alloca (b);
+}