Bug #22219: IO::Buffer#free, #resize and #transfer should raise FrozenError if the receiver is frozen

• Status: Open
• Assignee: -
• Target version: -
• Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN

[himura467 (Akito Shitara)]

Currently IO::Buffer#free, #resize and #transfer can be called even if the receiver is frozen. All three release, reallocate or hand away the memory the buffer references, so they change the state of the buffer. Therefore it seems a bug to me, and these methods should raise FrozenError if the receiver is frozen.

# Current
IO::Buffer.new(4).freeze.free       # succeeds, the buffer becomes null
IO::Buffer.new(4).freeze.resize(8)  # succeeds, the memory is reallocated
IO::Buffer.new(4).freeze.transfer   # succeeds, the receiver becomes null

# Expected
IO::Buffer.new(4).freeze.free       # raise FrozenError
IO::Buffer.new(4).freeze.resize(8)  # raise FrozenError
IO::Buffer.new(4).freeze.transfer   # raise FrozenError

Methods to fix:

• IO::Buffer#free
• IO::Buffer#resize
• IO::Buffer#transfer

[himura467 (Akito Shitara)]

PR

for IO::Buffer#free and IO::Buffer#resize: https://github.com/ruby/ruby/pull/18129
for IO::Buffer#transfer: https://github.com/ruby/ruby/pull/18130