netdev - Re: [PATCH] TX_RING and packet mmap

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Message-ID: <20090412205334.GA14345@ioremap.net>
Date:	Mon, 13 Apr 2009 00:53:34 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Johann Baudy <johann.baudy@...-log.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, jamal <hadi@...erus.ca>
Subject: Re: [PATCH] TX_RING and packet mmap

On Sun, Apr 12, 2009 at 10:30:34PM +0200, Johann Baudy (johann.baudy@...-log.net) wrote:
> Where do you see that skb_shinfo(skb)->frags[i].page (not other
> fields) can be overwritten ?

pull_pages:
	eat = delta;
	k = 0;
	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
		if (skb_shinfo(skb)->frags[i].size <= eat) {
			put_page(skb_shinfo(skb)->frags[i].page);
			eat -= skb_shinfo(skb)->frags[i].size;
		} else {
			skb_shinfo(skb)->frags[k] = skb_shinfo(skb)->frags[i];


-- 
	Evgeniy Polyakov
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