Bug #19323: Integer overflow in `Integer#<<`

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE, 3.2: DONE

[nobu (Nobuyoshi Nakada)]

require 'rbconfig/sizeof'
char_bit = RbConfig::LIMITS["UCHAR_MAX"].bit_length
size_max = RbConfig::LIMITS["SIZE_MAX"]
size_bit_max = size_max * char_bit
1 << size_bit_max

The above code raises an "integer overflow" error.

-:5:in `<<': integer overflow: 4611686018427387905 * 4 > 18446744073709551615 (ArgumentError)
	from -:5:in `<main>'

It doesn't seem like a proper or intentional exception.

[nobu (Nobuyoshi Nakada)]

https://github.com/ruby/ruby/pull/7087

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset git|1cdf8ab07b24ebd16e93621957196e8b1d67f2ba.

---

[Bug #19323] Raise RangeError instead of integer overflow

[Eregon (Benoit Daloze)]

• Related to Bug #18518: NoMemoryError + [FATAL] failed to allocate memory for twice 1 << large added

[usa (Usaku NAKAMURA)]

• Backport changed from 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED to 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE, 3.2: REQUIRED

backported into ruby_3_1 at 344249674f7a7835445a44695664897fa4b83f00

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE, 3.2: REQUIRED to 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE, 3.2: DONE

ruby_3_2 a048f7882a13e96080021a5bc13ef1fb293b4985 merged revision(s) 1cdf8ab07b24ebd16e93621957196e8b1d67f2ba.