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

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Message-ID: <CAPwn2JTjUp4oNRDgiVyQdsg+eft+NV=EJmyQxvq63M4p0RhBiw@mail.gmail.com>
Date:   Fri, 9 Jun 2017 20:43:26 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        David Miller <davem@...emloft.net>,
        network dev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net/flow: fix fc->percpu NULL pointer dereference

2017-06-09 20:29 GMT+08:00 Hangbin Liu <liuhangbin@...il.com>:
> On Fri, Jun 09, 2017 at 05:49:50PM +0800, Xin Long wrote:
>> another fix is to move xfrm_garbage_collect out of xfrm_policy_flush.
>> I could only see two places need to call it.
>> something like:
>>
>> --- a/net/key/af_key.c
>> +++ b/net/key/af_key.c
>> @@ -2755,6 +2755,8 @@ static int pfkey_spdflush(struct sock *sk,
>> struct sk_buff *skb, const struct sad
>>         int err, err2;
>>
>>         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
>> +       if (!err)
>> +               xfrm_garbage_collect(net);
>>         err2 = unicast_flush_resp(sk, hdr);
>>         if (err || err2) {
>>                 if (err == -ESRCH) /* empty table - old silent behavior */
>
> Hmm, that would be better, just the xfrm_garbage_collect() need to be after
> err || err2 check
>
> +          xfrm_garbage_collect(net);

Ah, my mistake.  we should check err first. Sorry.

>
> I will send v2 patch.
>
> Thanks
> Hangbin