netdev - Re: [PATCH net V2] openvswitch: fix skb_panic due to the incorrect actions attrlen

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Date:   Wed, 16 Aug 2017 09:44:56 +0800
From:   Liping Zhang <zlpnobody@...il.com>
To:     Pravin Shelar <pshelar@....org>
Cc:     Liping Zhang <zlpnobody@....com>,
        Pravin Shelar <pshelar@...ira.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Neil McKee <neil.mckee@...on.com>
Subject: Re: [PATCH net V2] openvswitch: fix skb_panic due to the incorrect
 actions attrlen

2017-08-16 7:35 GMT+08:00 Pravin Shelar <pshelar@....org>:
[...]
>> diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
>> index e4610676299b..f849ef52853f 100644
>> --- a/net/openvswitch/actions.c
>> +++ b/net/openvswitch/actions.c
>> @@ -921,6 +921,7 @@ static int output_userspace(struct datapath *dp, struct sk_buff *skb,
>>                         /* Include actions. */
>>                         upcall.actions = actions;
>>                         upcall.actions_len = actions_len;
>> +                       upcall.actions_attrlen = OVS_CB(skb)->acts_origlen;
> OVS_CB acts_origlen should be accessible in upcall_msg_size (), is
> there reason to add this member to struct dp_upcall_info?

Hmm... this means we should add an extra parameter to the upcall_msg_size()
function, i.e.:
 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
-                             unsigned int hdrlen)
+                             unsigned int hdrlen, int actions_attrlen)

So which one do you prefer? If the latter, I can send V3.