linux-kernel - [PATCH 3.12 38/77] netpoll: Fix missing TXQ unlock and and OOPS.

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Message-Id: <20140114002753.585811748@linuxfoundation.org>
Date:	Mon, 13 Jan 2014 16:27:59 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ahmed Tamrawi <atamrawi@...tate.edu>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.12 38/77] netpoll: Fix missing TXQ unlock and and OOPS.

3.12-stable review patch.  If anyone has any objections, please let me know.

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

From: "David S. Miller" <davem@...emloft.net>

[ Upstream commit aca5f58f9ba803ec8c2e6bcf890db17589e8dfcc ]

The VLAN tag handling code in netpoll_send_skb_on_dev() has two problems.

1) It exits without unlocking the TXQ.

2) It then tries to queue a NULL skb to npinfo->txq.

Reported-by: Ahmed Tamrawi <atamrawi@...tate.edu>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/netpoll.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -386,8 +386,14 @@ void netpoll_send_skb_on_dev(struct netp
 					    !vlan_hw_offload_capable(netif_skb_features(skb),
 								     skb->vlan_proto)) {
 						skb = __vlan_put_tag(skb, skb->vlan_proto, vlan_tx_tag_get(skb));
-						if (unlikely(!skb))
-							break;
+						if (unlikely(!skb)) {
+							/* This is actually a packet drop, but we
+							 * don't want the code at the end of this
+							 * function to try and re-queue a NULL skb.
+							 */
+							status = NETDEV_TX_OK;
+							goto unlock_txq;
+						}
 						skb->vlan_tci = 0;
 					}
 
@@ -395,6 +401,7 @@ void netpoll_send_skb_on_dev(struct netp
 					if (status == NETDEV_TX_OK)
 						txq_trans_update(txq);
 				}
+			unlock_txq:
 				__netif_tx_unlock(txq);
 
 				if (status == NETDEV_TX_OK)


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