Subject: Re: [PATCH v3] core, nfqueue, openvswitch: Orphan frags in skb_zerocopy and handle errors

From: Zoltan Kiss <[email-masked]>
Date: Fri, 21 Mar 2014 10:35:13 +0000

On 20/03/14 22:22, Thomas Graf wrote:
> On 03/20/2014 05:02 PM, Zoltan Kiss wrote:
>> --- a/net/openvswitch/datapath.c
>> +++ b/net/openvswitch/datapath.c
>> @@ -464,7 +464,9 @@ static int queue_userspace_packet(struct datapath
>> *dp, struct sk_buff *skb,
>>       }
>>       nla->nla_len = nla_attr_size(skb->len);
>>
>> -    skb_zerocopy(user_skb, skb, skb->len, hlen);
>> +    err = skb_zerocopy(user_skb, skb, skb->len, hlen);
>> +    if (err)
>> +        goto out;
>>
>>       /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
>>       if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
>> @@ -478,6 +480,7 @@ static int queue_userspace_packet(struct datapath
>> *dp, struct sk_buff *skb,
>>
>>       err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb,
>> upcall_info->portid);
>>   out:
>> +    skb_tx_error(skb);
>
> Really sorry to bug you again. We'll get this right ;-)
>
> Patch looks great except for this call to skb_tx_error() which is now
> done in the error *and* success path. Make the call conditional on
> if (err) and we're good.
Ah, sorry, I'm really sloppy with this patch. I've sent a fixed one.

Zoli