linux-kernel - [34/49] igb: only use vlan_gro_receive if vlans are registered

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Date:	Wed, 05 Jan 2011 15:00:52 -0800
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,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [34/49] igb: only use vlan_gro_receive if vlans are registered

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

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

From: Alexander Duyck <alexander.h.duyck@...el.com>

commit 31b24b955c3ebbb6f3008a6374e61cf7c05a193c upstream.

This change makes it so that vlan_gro_receive is only used if vlans have been
registered to the adapter structure.  Previously we were just sending all vlan
tagged frames in via this function but this results in a null pointer
dereference when vlans are not registered.

[ This fixes bugzilla entry 15582 -Eric Dumazet]

Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/igb/igb_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -4560,7 +4560,7 @@ static void igb_receive_skb(struct igb_r
 	bool vlan_extracted = (adapter->vlgrp && (status & E1000_RXD_STAT_VP));
 
 	skb_record_rx_queue(skb, ring->queue_index);
-	if (vlan_extracted)
+	if (vlan_extracted && adapter->vlgrp)
 		vlan_gro_receive(&ring->napi, adapter->vlgrp,
 		                 le16_to_cpu(rx_desc->wb.upper.vlan),
 		                 skb);


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