ptp_clock should never be registered unless it stubs one of gettimex64() or gettime64() and settime64(). WARN_ON_ONCE and error out if either set of function pointers is null.
Cc: stable@vger.kernel.org Fixes: d7d38f5bd7be ("ptp: use the 64 bit get/set time methods for the posix clock.") Suggested-by: Kuniyuki Iwashima kuniyu@google.com Reviewed-by: Kuniyuki Iwashima kuniyu@google.com Reviewed-by: Harshitha Ramamurthy hramamurthy@google.com Signed-off-by: Tim Hostetler thostet@google.com --- drivers/ptp/ptp_clock.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c index ef020599b771..0bc79076771b 100644 --- a/drivers/ptp/ptp_clock.c +++ b/drivers/ptp/ptp_clock.c @@ -325,6 +325,10 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, if (info->n_alarm > PTP_MAX_ALARMS) return ERR_PTR(-EINVAL);
+ if (WARN_ON_ONCE((!info->gettimex64 && !info->gettime64) || + !info->settime64)) + return ERR_PTR(-EINVAL); + /* Initialize a clock structure. */ ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL); if (!ptp) {