linux-kernel - [PATCH] [41/106] gro: reset skb

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Message-Id: <20110426211320.DFE183E1886@tassilo.jf.intel.com>
Date:	Tue, 26 Apr 2011 14:13:20 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	andy@...yhouse.net, davem@...emloft.net, bphilips@...e.de,
	gregkh@...e.de, ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [41/106] gro: reset skb_iif on reuse

2.6.35-longterm review patch.  If anyone has any objections, please let me 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>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

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

Index: linux-2.6.35.y/net/core/dev.c
===================================================================
--- linux-2.6.35.y.orig/net/core/dev.c
+++ linux-2.6.35.y/net/core/dev.c
@@ -3232,6 +3232,7 @@ 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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