netdev - Re: [PATCH net-next v3 3/3] ptp: support event queue reader channel masks

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Date: Sun, 1 Oct 2023 11:51:07 -0700
From: Richard Cochran <richardcochran@...il.com>
To: Simon Horman <horms@...nel.org>
Cc: Xabier Marquiegui <reibax@...il.com>, netdev@...r.kernel.org,
	chrony-dev@...ony.tuxfamily.org, mlichvar@...hat.com,
	ntp-lists@...tcorallo.com, vinicius.gomes@...el.com,
	alex.maftei@....com, davem@...emloft.net, rrameshbabu@...dia.com,
	shuah@...nel.org
Subject: Re: [PATCH net-next v3 3/3] ptp: support event queue reader channel
 masks

On Sun, Oct 01, 2023 at 05:12:02PM +0200, Simon Horman wrote:

> > @@ -169,19 +170,28 @@ long ptp_ioctl(struct posix_clock_user *pcuser, unsigned int cmd,
> >  {
> >  	struct ptp_clock *ptp =
> >  		container_of(pcuser->clk, struct ptp_clock, clock);
> > +	struct ptp_tsfilter tsfilter_set, *tsfilter_get = NULL;
> >  	struct ptp_sys_offset_extended *extoff = NULL;
> >  	struct ptp_sys_offset_precise precise_offset;
> >  	struct system_device_crosststamp xtstamp;
> >  	struct ptp_clock_info *ops = ptp->info;
> >  	struct ptp_sys_offset *sysoff = NULL;
> > +	struct timestamp_event_queue *tsevq;
> >  	struct ptp_system_timestamp sts;
> >  	struct ptp_clock_request req;
> >  	struct ptp_clock_caps caps;
> >  	struct ptp_clock_time *pct;
> > +	int lsize, enable, err = 0;
> >  	unsigned int i, pin_index;
> >  	struct ptp_pin_desc pd;
> >  	struct timespec64 ts;
> > -	int enable, err = 0;
> > +
> > +	tsevq = pcuser->private_clkdata;
> > +
> > +	if (tsevq->close_req) {
> > +		err = -EPIPE;
> > +		return err;
> > +	}
> 
> Here tseqv is dereferenced unconditionally...

Which is correct because the pointer is always set during open().

> 
> >  
> >  	switch (cmd) {
> >  
> > @@ -481,6 +491,79 @@ long ptp_ioctl(struct posix_clock_user *pcuser, unsigned int cmd,
> >  		mutex_unlock(&ptp->pincfg_mux);
> >  		break;
> >  
> > +	case PTP_FILTERCOUNT_REQUEST:
> > +		/* Calculate amount of device users */
> > +		if (tsevq) {
> 
> ... but here it is assumed that tseqv might be NULL.

Which is incorrect.  The test is pointless.

Thanks,
Richard