Hi Alex,
On 16/09/14 13:18, Alexander Aring wrote:
> On Tue, Sep 16, 2014 at 02:02:47PM +0200, Alexander Aring wrote:
>> On Tue, Sep 16, 2014 at 01:53:57PM +0200, Alexander Aring wrote:
>>> On Tue, Sep 16, 2014 at 01:47:59PM +0200, Alexander Aring wrote:
>>>> On Tue, Sep 16, 2014 at 12:39:11PM +0100, Martin Townsend wrote:
>>>>> Hi Alex,
>>>>> On 16/09/14 12:36, Alexander Aring wrote:
>>>>>> On Tue, Sep 16, 2014 at 12:01:59PM +0100, Martin Townsend wrote:
>>> ...
>>>> and this also smells like side effects for me, because we have the
>>>> local_skb which is sometimes freed inside of lowpan_process_data and
>>>> returning skb. Then we don't know which we should kfree_skb now, the skb
>>>> or local_skb now. Need to thing more about this to offer some solution,
>>>> somebody agree here with me?
>>>>
>>> I mean sometimes we do this *skb = *new and skb is the parameter and before
>>> we
>>> did a consume_skb(skb); then local_skb is already freed after this and
>>> returning an errno and we make kfree_skb(local_skb) will crash something,
>>> I suppose.
>> I meant skb = new for the expand skb thing. And we can't never free
>> kfree_skb(skb) here if (IS_ERR(skb) is true, but we can't decide if
>> we need a kfree_skb(local_skb) or not, because we do a
>> consume_skb($SKB_FROM_PARAMTER) in lowpan_process_data.
>>
> This all comes now in, because the ERR_PTR conversion. So we have two
> choices:
>
> - drop the ERR_PTR convertsion and make old behaviour
> - handle consume_skb/kfree_skb inside lowpan_process_data
>
> - Alex
>
How about a label for drop_local_skb?
switch (skb->data[0] & 0xe0) {
case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
local_skb = skb_clone(skb, GFP_ATOMIC);
if (!local_skb)
goto drop;
local_skb = process_data(local_skb, dev, chan);
if (IS_ERR(local_skb))
goto drop_local_skb;
local_skb->protocol = htons(ETH_P_IPV6);
local_skb->pkt_type = PACKET_HOST;
if (give_skb_to_upper(local_skb, dev)
!= NET_RX_SUCCESS) {
kfree_skb(local_skb);
goto drop;
}
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
kfree_skb(skb);
break;
default:
break;
}
}
return NET_RX_SUCCESS;
drop_local_skb:
kfree_skb(local_skb);
drop:
dev->stats.rx_dropped++;
kfree_skb(skb);
return NET_RX_DROP;
}
- Martin.
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