1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index e25d2bc898e5..296b0ec8744d 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -142,7 +142,10 @@ static int ptp_clock_adjtime(struct posix_clock *pc, struct timex *tx)
                 delta = ktime_to_ns(kt);
                 err = ops->adjtime(ops, delta);
         } else if (tx->modes & ADJ_FREQUENCY) {
-                err = ops->adjfreq(ops, scaled_ppm_to_ppb(tx->freq));
+                s32 ppb = scaled_ppm_to_ppb(tx->freq);
+                if (ppb > ops->max_adj || ppb < -ops->max_adj)
+                        return -ERANGE;
+                err = ops->adjfreq(ops, ppb);
                 ptp->dialed_frequency = tx->freq;
         } else if (tx->modes == 0) {
                 tx->freq = ptp->dialed_frequency;