netdev - Re: [net] tipc: fix using smp_processor

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Message-Id: <20200830.191411.329412155086247494.davem@davemloft.net>
Date:   Sun, 30 Aug 2020 19:14:11 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     tuong.t.lien@...tech.com.au
Cc:     jmaloy@...hat.com, maloy@...jonn.com, ying.xue@...driver.com,
        netdev@...r.kernel.org, tipc-discussion@...ts.sourceforge.net
Subject: Re: [net] tipc: fix using smp_processor_id() in preemptible

From: Tuong Lien <tuong.t.lien@...tech.com.au>
Date: Sun, 30 Aug 2020 02:37:55 +0700

> The 'this_cpu_ptr()' is used to obtain the AEAD key' TFM on the current
> CPU for encryption, however the execution can be preemptible since it's
> actually user-space context, so the 'using smp_processor_id() in
> preemptible' has been observed.
> 
> We fix the issue by using the 'get/put_cpu_ptr()' API which consists of
> a 'preempt_disable()' instead.
> 
> Fixes: fc1b6d6de220 ("tipc: introduce TIPC encryption & authentication")
> Acked-by: Jon Maloy <jmaloy@...hat.com>
> Signed-off-by: Tuong Lien <tuong.t.lien@...tech.com.au>

Applied and queued up for -stable.