linux-kernel - Re: [PATCH net] net: x25: Correct locking for x25_kill_by_device and x25_kill_by

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Message-ID: <CAJht_EMN14idYb9uY6eSASVb+ZHM6jZ3c=Kr5mTSjVE+2aYyoA@mail.gmail.com>
Date:   Sat, 14 Nov 2020 19:11:13 -0800
From:   Xie He <xie.he.0141@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux X25 <linux-x25@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Martin Schiller <ms@....tdt.de>
Subject: Re: [PATCH net] net: x25: Correct locking for x25_kill_by_device and x25_kill_by_neigh

On Sat, Nov 14, 2020 at 2:36 AM Xie He <xie.he.0141@...il.com> wrote:
>
> This patch adds correct locking for x25_kill_by_device and
> x25_kill_by_neigh, and removes the incorrect locking in x25_connect and
> x25_disconnect.

I see if I do this change, I need to make sure the sock lock is not
held when calling x25_remove_socket, to prevent deadlock.

Sorry. I'll deal with this issue and resubmit.

I also see that in x25_find_listener and __x25_find_socket, when we
traverse x25_list, we should probably also hold the sock lock when we
read the element of the list, and continue to hold the lock when we
find the sock we want.