linux-kernel - Re: [PATCH net-next V6] ptp: fix corrupted list in ptp

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Message-ID: <ZUegf5Od1rWxZ7rO@hoboy.vegasvil.org>
Date:   Sun, 5 Nov 2023 06:02:39 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Edward Adam Davis <eadavis@...com>
Cc:     davem@...emloft.net, habetsm.xilinx@...il.com, jeremy@...ine.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        reibax@...il.com,
        syzbot+df3f3ef31f60781fa911@...kaller.appspotmail.com
Subject: Re: [PATCH net-next V6] ptp: fix corrupted list in ptp_open

On Sun, Nov 05, 2023 at 05:36:41AM -0800, Richard Cochran wrote:

> > @@ -44,6 +44,7 @@ struct ptp_clock {
> >  	struct pps_device *pps_source;
> >  	long dialed_frequency; /* remembers the frequency adjustment */
> >  	struct list_head tsevqs; /* timestamp fifo list */
> > +	spinlock_t tsevqs_lock; /* one process at a time writing the timestamp fifo list*/
> 
> Please change this comment to "protects tsevqs from concurrent access"

And please don't forget to take the spin lock around
list_for_each_entry() in ptp_clock_event().

Thanks,
Richard