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authorshyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2007-08-22 01:32:19 +0000
committershyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2007-08-22 01:32:19 +0000
commitc204c6b71bad7db3b95484f519f89da26ce7bc02 (patch)
treeab60aaa1f8788130bc13fe5460d00ab446439f50 /bignum.c
parentf25a57b3ef00ac4aff728615aca6764e89163099 (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_6@13186 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'bignum.c')
-rw-r--r--bignum.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/bignum.c b/bignum.c
index 3517db2..f56c7d2 100644
--- a/bignum.c
+++ b/bignum.c
@@ -1646,8 +1646,10 @@ rb_big_pow(x, y)
yy = FIX2LONG(y);
if (yy > 0) {
VALUE z = x;
+ 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;