linux-kernel - Re: [PATCH net-next V8 2/2] ptp: fix corrupted list in ptp

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Message-ID: <ZUnVhxktZCpFYwEg@hoboy.vegasvil.org>
Date:   Mon, 6 Nov 2023 22:13:27 -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 V8 2/2] ptp: fix corrupted list in ptp_open

On Mon, Nov 06, 2023 at 10:31:28PM +0800, Edward Adam Davis wrote:
> There is no lock protection when writing ptp->tsevqs in ptp_open() and
> ptp_release(), which can cause data corruption, use spin lock to avoid this
> issue.
> 
> Moreover, ptp_release() should not be used to release the queue in ptp_read(),
> and it should be deleted altogether.
> 
> Reported-and-tested-by: syzbot+df3f3ef31f60781fa911@...kaller.appspotmail.com
> Fixes: 8f5de6fb2453 ("ptp: support multiple timestamp event readers")
> Signed-off-by: Edward Adam Davis <eadavis@...com>

(This should go to net and not net-next.)

Acked-by: Richard Cochran <richardcochran@...il.com>