Bug #10465: Bug of multiplication between Bignums

• Status: Closed
• Assignee: Nishihama (Kohji Nishihama)
• Target version: -
• ruby -v: ruby 2.1.4p265 (2014-10-27 revision 48166) [i386-mingw32]
• Backport: 2.0.0: DONTNEED, 2.1: DONE

[Nishihama (Kohji Nishihama)]

I calculate multiplication of a certain pear of Bignums,
and a wrong result is outputted.

OS:Windows Vista Home Premium。
bug.rb works on
ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-mswin32],
ruby 1.9.3p484 (2013-11-22) [i386-mingw32],
ruby 2.0.0p353 (2013-11-22) [i386-mingw32].
It doesn't work on
ruby 2.1.3p242 (2014-09-19 revision 47630) [i386-mingw32]
and ruby 2.1.4p265 (2014-10-27 revision 48166) [i386-mingw32].

$ ruby bug.rb 5470148495 # wrong number 1943359375 # correct number #The output is too long, and I wrote the only last 10 digit.

[Nishihama (Kohji Nishihama)]

• Copied from Bug #10464: Bignum同士の乗算の不具合 added

[akr (Akira Tanaka)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

Applied in changeset r48222.

---

• bignum.c (bary_mul_balance_with_mulfunc): Fix free work area
  location.
  [ruby-dev:48723] [Bug #10464]
  [ruby-core:66044] [Bug #10465]
  Reported by Kohji Nishihama.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN to 2.0.0: DONTNEED, 2.1: REQUIRED

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.0.0: DONTNEED, 2.1: REQUIRED to 2.0.0: DONTNEED, 2.1: DONE

Backported into ruby_2_1 at r48272.