* array.c (rb_ary_fill): check if beg is too big.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@17756 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/array.c b/array.c
index 7d8d406783..646ea16526 100644
--- a/array.c
+++ b/array.c
@@ -2145,7 +2145,7 @@ rb_ary_fill(int argc, VALUE *argv, VALUE ary)
 	break;
     }
     rb_ary_modify(ary);
-    if (len > ARY_MAX_SIZE - beg) {
+    if (beg >= ARY_MAX_SIZE || len > ARY_MAX_SIZE - beg) {
 	rb_raise(rb_eArgError, "argument too big");
     }
     end = beg + len;