net: add a truesize parameter to skb_add_rx_frag()

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 6eb656acdfe5..a690cae91cdd 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -321,12 +321,12 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
 EXPORT_SYMBOL(__netdev_alloc_skb);
 
 void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
-                int size)
+                     int size, unsigned int truesize)
 {
         skb_fill_page_desc(skb, i, page, off, size);
         skb->len += size;
         skb->data_len += size;
-        skb->truesize += size;
+        skb->truesize += truesize;
 }
 EXPORT_SYMBOL(skb_add_rx_frag);