linux-kernel - Re: [PATCH net 3/7] openvswitch: Fix skb leak in ovs

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Date:	Tue, 29 Sep 2015 16:12:57 -0700
From:	Joe Stringer <joestringer@...ira.com>
To:	"Rustad, Mark D" <mark.d.rustad@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"pshelar@...ira.com" <pshelar@...ira.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 3/7] openvswitch: Fix skb leak in ovs_fragment()

On 29 September 2015 at 15:48, Rustad, Mark D <mark.d.rustad@...el.com> wrote:
>> On Sep 29, 2015, at 3:39 PM, Joe Stringer <joestringer@...ira.com> wrote:
>>
>> @@ -728,8 +727,14 @@ static void ovs_fragment(struct vport *vport, struct sk_buff *skb, u16 mru,
>>               WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
>>                         ovs_vport_name(vport), ntohs(ethertype), mru,
>>                         vport->dev->mtu);
>> -             kfree_skb(skb);
>> +             goto out;
>>       }
>> +
>> +     skb = NULL;
>> +
>> +out:
>> +     if (skb)
>> +             kfree_skb(skb);
>> }
>>
>> static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
>
> Wouldn't that hunk be better as:
>
> @@ -728,8 +727,13 @@ static void ovs_fragment(struct vport *vport, struct sk_buff *skb, u16 mru,
>                 WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
>                           ovs_vport_name(vport), ntohs(ethertype), mru,
>                           vport->dev->mtu);
> -               kfree_skb(skb);
> +               goto out;
>         }
> +
> +       return;
> +
> +out:
> +       kfree_skb(skb);
> }
>
> static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
>
> --
> Mark Rustad, Networking Division, Intel Corporation

Sure thing, I'll roll this change in to a v2 when the rest of the
series is reviewed.
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