[omrzk]

_input.upload_effect() calls PyBytes_AsString() and copies from its result even when conversion failed, so a non-bytes argument crashes the interpreter. Check conversion and require enough bytes for struct ff_effect before copying. Complete byte strings (including subclasses and trailing data), ioctl errors, and the InputDevice.upload_effect() serialization path retain their behavior.

Fixes #261.

Validation: all 13 new native-extension tests pass on Python 3.14. On current main, six non-bytes cases terminate subprocesses with SIGSEGV and three short-buffer cases fail; four preservation controls pass. All 20 tests outside the uinput module pass. The full suite has 24 passes and six failures because this runner has no /dev/uinput; the same six fail on clean main. Native build, wheel/sdist build, pylint error check and changed-test Ruff pass. Documentation builds with two missing ecodes_generated warnings. No actual force-feedback/input hardware was tested.