Re: [PATCH v4 bluetooth] 6lowpan: fix incorrect return values in lowpan_rcv

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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.

- Alex
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