netdev - Re: [PATCH net] net/flow: fix fc->percpu NULL pointer dereference

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Message-ID: <20170609083255.GR22049@secunet.com>
Date:   Fri, 9 Jun 2017 10:32:55 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Hangbin Liu <liuhangbin@...il.com>
CC:     David Miller <davem@...emloft.net>,
        Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net/flow: fix fc->percpu NULL pointer dereference

On Fri, Jun 09, 2017 at 04:23:01PM +0800, Hangbin Liu wrote:
> Hi Steffen,
> 
> BTW, If we put the check in xfrm_policy_flush(), we can prevent it earlier.
> But If we put the check in flow_cache_percpu_empty(), we can prevent
> other functions set fc->percpu to NULL, although not much possible : )
> 
> So I'm not quite sure whether we should put the check in
> flow_cache_percpu_empty() or in xfrm_policy_flush().

Can't we just call xfrm_policy_fini() first and then flow_cache_fini()?