netdev - Re: mac80211 truesize bugs

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Date:	Sun, 04 May 2008 01:24:48 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	David Miller <davem@...emloft.net>
Cc:	herbert@...dor.apana.org.au, mb@...sch.de, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: mac80211 truesize bugs


> > @@ -699,6 +699,12 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
> >  	if (skb_shared(skb))
> >  		BUG();
> >  
> > +	if (unlikely((nhead || ntail) && skb->sk)) {
> > +		printk(KERN_ERR "SKB BUG: Illegal pskb expand (%d:%d) "
> > +		       "with socket attached\n",
> > +		       nhead, ntail);
> > +	}
> > +
> >  	size = SKB_DATA_ALIGN(size);
> 
> Ok I think I'm starting to understand this a little better. However,
> shouldn't this function update skb->truesize so if the skb is later
> attached to a different socket again it has the right size?

Judging from some of the callers, the caller should. Why?!

johannes

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