linux-kernel - [PATCH net-2.6 v2] epic100: hamachi: yellowfin: Fix skb allocation size

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Date:	Sat, 25 Dec 2010 18:39:59 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Joel Soete <soete.joel@...rlet.be>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: [PATCH net-2.6 v2] epic100: hamachi: yellowfin: Fix skb allocation
 size

Joel Soete reported oopses during pppoe over sundance NIC, caused by
a bug in skb allocation and dma mapping code, where skb_reserve()
bytes weren't taken into account. As a followup to the patch:
"sundance: Fix oopses with corrupted skb_shared_info" very similar
code is fixed here for three other drivers.

Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
Cc: Joel Soete <soete.joel@...rlet.be>
Cc: Eric Dumazet <eric.dumazet@...il.com>
---
v2: a tiny changelog fix only

 drivers/net/epic100.c   |    4 ++--
 drivers/net/hamachi.c   |    4 ++--
 drivers/net/yellowfin.c |    4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/epic100.c b/drivers/net/epic100.c
index aa56963..c353bf3 100644
--- a/drivers/net/epic100.c
+++ b/drivers/net/epic100.c
@@ -935,7 +935,7 @@ static void epic_init_ring(struct net_device *dev)
 
 	/* Fill in the Rx buffers.  Handle allocation failure gracefully. */
 	for (i = 0; i < RX_RING_SIZE; i++) {
-		struct sk_buff *skb = dev_alloc_skb(ep->rx_buf_sz);
+		struct sk_buff *skb = dev_alloc_skb(ep->rx_buf_sz + 2);
 		ep->rx_skbuff[i] = skb;
 		if (skb == NULL)
 			break;
@@ -1233,7 +1233,7 @@ static int epic_rx(struct net_device *dev, int budget)
 		entry = ep->dirty_rx % RX_RING_SIZE;
 		if (ep->rx_skbuff[entry] == NULL) {
 			struct sk_buff *skb;
-			skb = ep->rx_skbuff[entry] = dev_alloc_skb(ep->rx_buf_sz);
+			skb = ep->rx_skbuff[entry] = dev_alloc_skb(ep->rx_buf_sz + 2);
 			if (skb == NULL)
 				break;
 			skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
diff --git a/drivers/net/hamachi.c b/drivers/net/hamachi.c
index 9a64858..80d25ed 100644
--- a/drivers/net/hamachi.c
+++ b/drivers/net/hamachi.c
@@ -1202,7 +1202,7 @@ static void hamachi_init_ring(struct net_device *dev)
 	}
 	/* Fill in the Rx buffers.  Handle allocation failure gracefully. */
 	for (i = 0; i < RX_RING_SIZE; i++) {
-		struct sk_buff *skb = dev_alloc_skb(hmp->rx_buf_sz);
+		struct sk_buff *skb = dev_alloc_skb(hmp->rx_buf_sz + 2);
 		hmp->rx_skbuff[i] = skb;
 		if (skb == NULL)
 			break;
@@ -1669,7 +1669,7 @@ static int hamachi_rx(struct net_device *dev)
 		entry = hmp->dirty_rx % RX_RING_SIZE;
 		desc = &(hmp->rx_ring[entry]);
 		if (hmp->rx_skbuff[entry] == NULL) {
-			struct sk_buff *skb = dev_alloc_skb(hmp->rx_buf_sz);
+			struct sk_buff *skb = dev_alloc_skb(hmp->rx_buf_sz + 2);
 
 			hmp->rx_skbuff[entry] = skb;
 			if (skb == NULL)
diff --git a/drivers/net/yellowfin.c b/drivers/net/yellowfin.c
index cd1b3dc..ec47e22 100644
--- a/drivers/net/yellowfin.c
+++ b/drivers/net/yellowfin.c
@@ -744,7 +744,7 @@ static int yellowfin_init_ring(struct net_device *dev)
 	}
 
 	for (i = 0; i < RX_RING_SIZE; i++) {
-		struct sk_buff *skb = dev_alloc_skb(yp->rx_buf_sz);
+		struct sk_buff *skb = dev_alloc_skb(yp->rx_buf_sz + 2);
 		yp->rx_skbuff[i] = skb;
 		if (skb == NULL)
 			break;
@@ -1157,7 +1157,7 @@ static int yellowfin_rx(struct net_device *dev)
 	for (; yp->cur_rx - yp->dirty_rx > 0; yp->dirty_rx++) {
 		entry = yp->dirty_rx % RX_RING_SIZE;
 		if (yp->rx_skbuff[entry] == NULL) {
-			struct sk_buff *skb = dev_alloc_skb(yp->rx_buf_sz);
+			struct sk_buff *skb = dev_alloc_skb(yp->rx_buf_sz + 2);
 			if (skb == NULL)
 				break;				/* Better luck next round. */
 			yp->rx_skbuff[entry] = skb;
--
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