netdev - Re: [PATCH net 1/2] openvswitch: Fix helper reference leak

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Date:	Wed, 9 Dec 2015 15:10:21 -0800
From:	Joe Stringer <joe@....org>
To:	Pravin Shelar <pshelar@...ira.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net 1/2] openvswitch: Fix helper reference leak

On 9 December 2015 at 14:50, Pravin Shelar <pshelar@...ira.com> wrote:
> On Wed, Dec 9, 2015 at 2:07 PM, Joe Stringer <joe@....org> wrote:
>> If the actions (re)allocation fails, or the actions list is larger than the
>> maximum size, and the conntrack action is the last action when these
>> problems are hit, then references to helper modules may be leaked. Fix
>> the issue.
>>
>> Fixes: cae3a2627520 ("openvswitch: Allow attaching helpers to ct action")
>> Signed-off-by: Joe Stringer <joe@....org>
>> ---
>>  net/openvswitch/conntrack.c | 9 ++++++++-
>>  1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
>> index c2cc11168fd5..585a5aa81f89 100644
>> --- a/net/openvswitch/conntrack.c
>> +++ b/net/openvswitch/conntrack.c
>> @@ -53,6 +53,8 @@ struct ovs_conntrack_info {
>>         struct md_labels labels;
>>  };
>>
>> +static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
>> +
>>  static u16 key_to_nfproto(const struct sw_flow_key *key)
>>  {
>>         switch (ntohs(key->eth.type)) {
>> @@ -708,7 +710,7 @@ int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
>>         nf_conntrack_get(&ct_info.ct->ct_general);
>
> I see another issue here. Updates to ct_info are done after it is
> copied to action list. ct action on the action list and ct_info are
> inconsistent, So it is still leaking nf-conntrack reference.

You're referring to the below?

         __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
         nf_conntrack_get(&ct_info.ct->ct_general);

ct_info.ct points to the same location as the version that has been
copied into the action list. I agree it's a bit misleading though. If
you're not seeing something else, it seems cosmetic so I can (should?)
follow up on net-next.
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