diff options
author | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2007-07-18 07:57:45 +0000 |
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committer | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2007-07-18 07:57:45 +0000 |
commit | f2dd1b158e41ecc883954277a12d9b1f447143f6 (patch) | |
tree | 92ec61f4224727f5ef47007f219d38929676cae5 /bignum.c | |
parent | 0b0046dc2ea34497071e95431c1034a79001e096 (diff) |
* bignum.c (rb_big_pow): refine overflow check. [ruby-dev:31242]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@12813 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'bignum.c')
-rw-r--r-- | bignum.c | 4 |
1 files changed, 3 insertions, 1 deletions
@@ -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; |