Commit c29f9aa3 authored by Vladimir Oltean's avatar Vladimir Oltean Committed by David S. Miller

ptp: only allow phase values lower than 1 period

The way we define the phase (the difference between the time of the
signal's rising edge, and the closest integer multiple of the period),
it doesn't make sense to have a phase value equal or larger than 1
period.

So deny these settings coming from the user.
Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
Acked-by: default avatarRichard Cochran <richardcochran@gmail.com>
Acked-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4c900a6b
......@@ -218,6 +218,19 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
break;
}
}
if (perout->flags & PTP_PEROUT_PHASE) {
/*
* The phase should be specified modulo the
* period, therefore anything equal or larger
* than 1 period is invalid.
*/
if (perout->phase.sec > perout->period.sec ||
(perout->phase.sec == perout->period.sec &&
perout->phase.nsec >= perout->period.nsec)) {
err = -ERANGE;
break;
}
}
} else if (cmd == PTP_PEROUT_REQUEST) {
req.perout.flags &= PTP_PEROUT_V1_VALID_FLAGS;
req.perout.rsv[0] = 0;
......
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