* io.c (rb_f_syscall): Fix buffer overflow with syscall

  arguments.  [ruby-bugs:PR#8541]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11709 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/io.c b/io.c
index d4885080d1..57db4a4d05 100644
--- a/io.c
+++ b/io.c
@@ -4980,6 +4980,8 @@ rb_f_syscall(int argc, VALUE *argv)
     rb_secure(2);
     if (argc == 0)
 	rb_raise(rb_eArgError, "too few arguments for syscall");
+    if (argc > sizeof(arg) / sizeof(arg[0]))
+	rb_raise(rb_eArgError, "too many arguments for syscall");
     arg[0] = NUM2LONG(argv[0]); argv++;
     while (items--) {
 	VALUE v = rb_check_string_type(*argv);