* bignum.c (big2str_find_n1): check integer overflow.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@15646 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/bignum.c b/bignum.c
index 9a5bd0c228..6d1b5547a5 100644
--- a/bignum.c
+++ b/bignum.c
@@ -676,6 +676,9 @@ rb_big2str0(x, base, trim)
     if (BIGZEROP(x)) {
 	return rb_str_new2("0");
     }
+    if (i >= LONG_MAX/SIZEOF_BDIGITS/CHAR_BIT) {
+	rb_raise(rb_eRangeError, "bignum too big to convert into `string'");
+    }
     j = SIZEOF_BDIGITS*CHAR_BIT*i;
     switch (base) {
       case 2: break;