linux-kernel - Re: [PATCH v3] core, nfqueue, openvswitch: Orphan frags in skb

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Message-ID: <532C15E1.4070501@citrix.com>
Date:	Fri, 21 Mar 2014 10:35:13 +0000
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	Thomas Graf <tgraf@...hat.com>, Jesse Gross <jesse@...ira.com>,
	<pshelar@...ira.com>, <dev@...nvswitch.org>
CC:	"David S. Miller" <davem@...emloft.net>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Eric Dumazet <edumazet@...gle.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Tom Herbert <therbert@...gle.com>,
	Jason Wang <jasowang@...hat.com>,
	Florian Westphal <fw@...len.de>, Joe Perches <joe@...ches.com>,
	Simon Horman <horms@...ge.net.au>,
	Jiri Pirko <jiri@...nulli.us>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Paul Durrant <Paul.Durrant@...rix.com>,
	Jan Beulich <JBeulich@...e.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Miklos Szeredi <mszeredi@...e.cz>,
	<netfilter-devel@...r.kernel.org>, <netfilter@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>
Subject: Re: [PATCH v3] core, nfqueue, openvswitch: Orphan frags in skb_zerocopy
 and handle errors

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
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