diff options
-rw-r--r-- | ChangeLog | 4 | ||||
-rw-r--r-- | bignum.c | 4 |
2 files changed, 7 insertions, 1 deletions
@@ -1,3 +1,7 @@ +Wed Jul 18 16:57:41 2007 Nobuyoshi Nakada <nobu@ruby-lang.org> + + * bignum.c (rb_big_pow): refine overflow check. [ruby-dev:31242] + Wed Jul 18 08:47:09 2007 Yukihiro Matsumoto <matz@ruby-lang.org> * time.c (time_succ): Time#succ should return a time object in the @@ -1755,8 +1755,10 @@ rb_big_pow(x, y) if (yy > 0) { VALUE z = 0; long mask; + const long BIGLEN_LIMIT = 1024*1024 / SIZEOF_BDIGITS; - if (RBIGNUM(x)->len * SIZEOF_BDIGITS * yy > 1024*1024) { + if ((RBIGNUM(x)->len > BIGLEN_LIMIT) || + (RBIGNUM(x)->len > BIGLEN_LIMIT / yy)) { rb_warn("in a**b, b may be too big"); d = (double)yy; break; |