Do not overflow string buffer (PR objc/85476).

2018-04-20  Martin Liska  <mliska@suse.cz>

	PR objc/85476
	* objc-act.c (finish_class): Do not overflow string buffer.

From-SVN: r259521

gcc/objc/ChangeLog

+2018-04-20  Martin Liska  <mliska@suse.cz>
+
+	PR objc/85476
+	* objc-act.c (finish_class): Do not overflow string buffer.
+
 2018-01-03  Jakub Jelinek  <jakub@redhat.com>
 
 	Update copyright years.

gcc/objc/objc-act.c

@@ -8003,7 +8003,7 @@ finish_class (tree klass)
 		    char *setter_name = (char *) alloca (length);
 		    tree ret_type, selector, arg_type, arg_name;
 
-		    strcpy (setter_name, full_setter_name);
+		    memcpy (setter_name, full_setter_name, length - 1);
 		    setter_name[length - 1] = '\0';
 		    ret_type = build_tree_list (NULL_TREE, void_type_node);
 		    arg_type = build_tree_list (NULL_TREE, TREE_TYPE (x));