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net: add a truesize parameter to skb_add_rx_frag()

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skb_add_rx_frag() API is misleading.

Network skbs built with this helper can use uncharged kernel memory and
eventually stress/crash machine in OOM.

Add a 'truesize' parameter and then fix drivers in followup patches.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-03-23 23:59:33 +00:00 • committed by David S. Miller
commit 50269e19ad
7 changed files with 13 additions and 9 deletions
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2
include/linux/skbuff.h
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@ -1244,7 +1244,7 @@ static inline void skb_fill_page_desc(struct sk_buff *skb, int i,
}
extern void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page,
int off, int size);
int off, int size, unsigned int truesize);
#define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags)
#define SKB_FRAG_ASSERT(skb) BUG_ON(skb_has_frag_list(skb))