ctl_ioctl_frontend: Reject out-of-range initiator IDs

[jhb]

Summary

Various places in CTL assume that initiator IDs are not larger than
CTL_MAX_INIT_PER_PORT. Other IDs such as lun IDs are validated in
places such as ctl_scsiio_precheck, but initiator IDs submitted by
userland were not previously validated.

PR: 291059
Reported by: Hans Rosenfeld <[e-mail]>
Sponsored by: Chelsio Communications

[asomers]

Good catch. Is this something that can be triggered with libcam?

[jhb]

Hans was able to trigger it with the virtio-scsi device model in bhyve. Presumably that was using libcam?