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Date:   Sun, 30 Aug 2020 19:14:11 -0700 (PDT)
From:   David Miller <>
Subject: Re: [net] tipc: fix using smp_processor_id() in preemptible

From: Tuong Lien <>
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 <>
> Signed-off-by: Tuong Lien <>

Applied and queued up for -stable.

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