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numeric.c: Fix Integer#pow with a large Fixnum modulo

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* numeric.c: Fix Integer#pow with a large Fixnum modulo
  [Bug #14259] [ruby-core:84562]

* test/ruby/test_numeric.rb: add assertions for reproducing this bug.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61517 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
mrkn 2017-12-30 14:50:15 +00:00
parent d83e02017e
commit f92924923d
2 changed files with 8 additions and 1 deletions
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4
bignum.c
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@ -7016,7 +7016,9 @@ int_pow_tmp2(VALUE x, VALUE y, long mm, int nega_flg)
xx = MUL_MODULO(xx, xx, m);
}
#ifndef DLONG
#ifdef DLONG
tmp = tmp2;
#else
tmp = FIX2LONG(tmp2);
#endif
if (nega_flg && tmp) {

5
test/ruby/test_numeric.rb
View file

@ -400,6 +400,11 @@ class TestNumeric < Test::Unit::TestCase
2120078484650058507891187874713297895455.
pow(5478118174010360425845660566650432540723,
5263488859030795548286226023720904036518))
assert_equal(12, 12.pow(1, 10000000000), '[Bug #14259]')
assert_equal(12, 12.pow(1, 10000000001), '[Bug #14259]')
assert_equal(12, 12.pow(1, 10000000002), '[Bug #14259]')
assert_equal(17298641040, 12.pow(72387894339363242, 243682743764), '[Bug #14259]')
end
end