linux-kernel - [54/71] gro: reset skb

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Date:	Wed, 13 Apr 2011 09:10:17 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Andy Gospodarek <andy@...yhouse.net>,
	"David S. Miller" <davem@...emloft.net>,
	Brandon Philips <bphilips@...e.de>
Subject: [54/71] gro: reset skb_iif on reuse

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Andy Gospodarek <andy@...yhouse.net>

commit 6d152e23ad1a7a5b40fef1f42e017d66e6115159 upstream.

Like Herbert's change from a few days ago:

66c46d741e2e60f0e8b625b80edb0ab820c46d7a gro: Reset dev pointer on reuse

this may not be necessary at this point, but we should still clean up
the skb->skb_iif.  If not we may end up with an invalid valid for
skb->skb_iif when the skb is reused and the check is done in
__netif_receive_skb.

Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Brandon Philips <bphilips@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/core/dev.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2747,6 +2747,7 @@ void napi_reuse_skb(struct napi_struct *
 	__skb_pull(skb, skb_headlen(skb));
 	skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
 	skb->dev = napi->dev;
+	skb->skb_iif = 0;

 	napi->skb = skb;
 }

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