netdev - Re: [PATCH net] s390/qeth: serialize cmd reply with concurrent timeout

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Date:   Tue, 13 Aug 2019 19:28:55 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Julian Wiedmann <jwi@...ux.ibm.com>
Cc:     David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-s390@...r.kernel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Stefan Raspl <raspl@...ux.ibm.com>,
        Ursula Braun <ubraun@...ux.ibm.com>
Subject: Re: [PATCH net] s390/qeth: serialize cmd reply with concurrent
 timeout

On Mon, 12 Aug 2019 16:44:35 +0200, Julian Wiedmann wrote:
> Callbacks for a cmd reply run outside the protection of card->lock, to
> allow for additional cmds to be issued & enqueued in parallel.
> 
> When qeth_send_control_data() bails out for a cmd without having
> received a reply (eg. due to timeout), its callback may concurrently be
> processing a reply that just arrived. In this case, the callback
> potentially accesses a stale reply->reply_param area that eg. was
> on-stack and has already been released.
> 
> To avoid this race, add some locking so that qeth_send_control_data()
> can (1) wait for a concurrently running callback, and (2) zap any
> pending callback that still wants to run.
> 
> Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>

Applied to net, thank you.

Please consider adding the Fixes tag for net submissions.