linux-kernel - Re: [PATCH net-next V3] ptp: fix corrupted list in ptp

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Message-ID: <ZUV_1CZRUQTiANTT@hoboy.vegasvil.org>
Date:   Fri, 3 Nov 2023 16:18:44 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Edward Adam Davis <eadavis@...com>
Cc:     jeremy@...ine.org, davem@...emloft.net, habetsm.xilinx@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        reibax@...il.com,
        syzbot+df3f3ef31f60781fa911@...kaller.appspotmail.com
Subject: Re: [PATCH net-next V3] ptp: fix corrupted list in ptp_open

On Fri, Nov 03, 2023 at 09:15:03PM +0800, Edward Adam Davis wrote:
> There is no lock protection when writing ptp->tsevqs in ptp_open(),
> ptp_release(), which can cause data corruption, use mutex lock to avoid this
> issue.

The problem is the bogus call to ptp_release() in ptp_read().

Just delete that.

No need for another mutex.

Thanks,
Richard