linux-kernel - [030/244] ibmveth: Fix leak when recycling skb and hypervisor returns error

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Message-Id: <20110928220128.399630785@clark.kroah.org>
Date:	Wed, 28 Sep 2011 14:59:54 -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,
	Anton Blanchard <anton@...ba.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [030/244] ibmveth: Fix leak when recycling skb and hypervisor returns error

3.0-stable review patch.  If anyone has any objections, please let us know.

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

From: Anton Blanchard <anton@...ba.org>

commit c6f59d13e24187ff95427a9f4a5a7e14fb8faf5a upstream.

If h_add_logical_lan_buffer returns an error we need to free
the skb.

Signed-off-by: Anton Blanchard <anton@...ba.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/ibmveth.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -394,7 +394,7 @@ static inline struct sk_buff *ibmveth_rx
 }
 
 /* recycle the current buffer on the rx queue */
-static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
+static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 {
 	u32 q_index = adapter->rx_queue.index;
 	u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
@@ -402,6 +402,7 @@ static void ibmveth_rxq_recycle_buffer(s
 	unsigned int index = correlator & 0xffffffffUL;
 	union ibmveth_buf_desc desc;
 	unsigned long lpar_rc;
+	int ret = 1;
 
 	BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 	BUG_ON(index >= adapter->rx_buff_pool[pool].size);
@@ -409,7 +410,7 @@ static void ibmveth_rxq_recycle_buffer(s
 	if (!adapter->rx_buff_pool[pool].active) {
 		ibmveth_rxq_harvest_buffer(adapter);
 		ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
-		return;
+		goto out;
 	}
 
 	desc.fields.flags_len = IBMVETH_BUF_VALID |
@@ -422,12 +423,16 @@ static void ibmveth_rxq_recycle_buffer(s
 		netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
 			   "during recycle rc=%ld", lpar_rc);
 		ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
+		ret = 0;
 	}
 
 	if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 		adapter->rx_queue.index = 0;
 		adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 	}
+
+out:
+	return ret;
 }
 
 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
@@ -1083,8 +1088,9 @@ restart_poll:
 				if (rx_flush)
 					ibmveth_flush_buffer(skb->data,
 						length + offset);
+				if (!ibmveth_rxq_recycle_buffer(adapter))
+					kfree_skb(skb);
 				skb = new_skb;
-				ibmveth_rxq_recycle_buffer(adapter);
 			} else {
 				ibmveth_rxq_harvest_buffer(adapter);
 				skb_reserve(skb, offset);


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