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From: Russell King <rmk+kernel@arm.linux.org.uk>
To: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH A 12/12] net: fec: fix missing kmalloc() failure check in fec_enet_alloc_buffers()
Date: Tue, 08 Jul 2014 00:23:30 +0100	[thread overview]
Message-ID: <E1X4IFu-0004xQ-5y@rmk-PC.arm.linux.org.uk> (raw)
In-Reply-To: <20140707232148.GG21766@n2100.arm.linux.org.uk>

fec_enet_alloc_buffers() assumes that kmalloc() will never fail, which
is an invalid assumption.  Fix this by implementing a common error
cleanup path, and use it to also clean up after failed bounce buffer
allocation.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/net/ethernet/freescale/fec_main.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 5499bd8ad0a5..f43c388e2eb9 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -2100,19 +2100,16 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
 		dma_addr_t addr;
 
 		skb = netdev_alloc_skb(ndev, FEC_ENET_RX_FRSIZE);
-		if (!skb) {
-			fec_enet_free_buffers(ndev);
-			return -ENOMEM;
-		}
+		if (!skb)
+			goto err_alloc;
 
 		addr = dma_map_single(&fep->pdev->dev, skb->data,
 				FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
 		if (dma_mapping_error(&fep->pdev->dev, addr)) {
 			dev_kfree_skb(skb);
-			fec_enet_free_buffers(ndev);
 			if (net_ratelimit())
 				netdev_err(ndev, "Rx DMA memory map failed\n");
-			return -ENOMEM;
+			goto err_alloc;
 		}
 
 		fep->rx_skbuff[i] = skb;
@@ -2134,6 +2131,8 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
 	bdp = fep->tx_bd_base;
 	for (i = 0; i < fep->tx_ring_size; i++) {
 		fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL);
+		if (!fep->tx_bounce[i])
+			goto err_alloc;
 
 		bdp->cbd_sc = 0;
 		bdp->cbd_bufaddr = 0;
@@ -2151,6 +2150,10 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
 	bdp->cbd_sc |= BD_SC_WRAP;
 
 	return 0;
+
+ err_alloc:
+	fec_enet_free_buffers(ndev);
+	return -ENOMEM;
 }
 
 static int
-- 
1.8.3.1

WARNING: multiple messages have this Message-ID (diff)
From: rmk+kernel@arm.linux.org.uk (Russell King)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH A 12/12] net: fec: fix missing kmalloc() failure check in fec_enet_alloc_buffers()
Date: Tue, 08 Jul 2014 00:23:30 +0100	[thread overview]
Message-ID: <E1X4IFu-0004xQ-5y@rmk-PC.arm.linux.org.uk> (raw)
In-Reply-To: <20140707232148.GG21766@n2100.arm.linux.org.uk>

fec_enet_alloc_buffers() assumes that kmalloc() will never fail, which
is an invalid assumption.  Fix this by implementing a common error
cleanup path, and use it to also clean up after failed bounce buffer
allocation.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/net/ethernet/freescale/fec_main.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 5499bd8ad0a5..f43c388e2eb9 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -2100,19 +2100,16 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
 		dma_addr_t addr;
 
 		skb = netdev_alloc_skb(ndev, FEC_ENET_RX_FRSIZE);
-		if (!skb) {
-			fec_enet_free_buffers(ndev);
-			return -ENOMEM;
-		}
+		if (!skb)
+			goto err_alloc;
 
 		addr = dma_map_single(&fep->pdev->dev, skb->data,
 				FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
 		if (dma_mapping_error(&fep->pdev->dev, addr)) {
 			dev_kfree_skb(skb);
-			fec_enet_free_buffers(ndev);
 			if (net_ratelimit())
 				netdev_err(ndev, "Rx DMA memory map failed\n");
-			return -ENOMEM;
+			goto err_alloc;
 		}
 
 		fep->rx_skbuff[i] = skb;
@@ -2134,6 +2131,8 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
 	bdp = fep->tx_bd_base;
 	for (i = 0; i < fep->tx_ring_size; i++) {
 		fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL);
+		if (!fep->tx_bounce[i])
+			goto err_alloc;
 
 		bdp->cbd_sc = 0;
 		bdp->cbd_bufaddr = 0;
@@ -2151,6 +2150,10 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
 	bdp->cbd_sc |= BD_SC_WRAP;
 
 	return 0;
+
+ err_alloc:
+	fec_enet_free_buffers(ndev);
+	return -ENOMEM;
 }
 
 static int
-- 
1.8.3.1

  parent reply	other threads:[~2014-07-07 23:23 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-07 23:21 [PATCH A 00/12] Freescale ethernet driver updates Russell King - ARM Linux
2014-07-07 23:21 ` Russell King - ARM Linux
2014-07-07 23:22 ` [PATCH A 01/12] net: fec: iMX6 FEC does not support half-duplex gigabit Russell King
2014-07-07 23:22   ` Russell King
2014-07-08 16:52   ` Sergei Shtylyov
2014-07-08 16:52     ` Sergei Shtylyov
2014-07-07 23:22 ` [PATCH A 02/12] net: fec: fix ethtool set_pauseparam duplex bug Russell King
2014-07-07 23:22   ` Russell King
2014-07-07 23:22 ` [PATCH A 03/12] net: fec: fix interrupt handling races Russell King
2014-07-07 23:22   ` Russell King
2014-07-07 23:22 ` [PATCH A 04/12] net: fec: use netif_tx_disable() rather than netif_stop_queue() Russell King
2014-07-07 23:22   ` Russell King
2014-07-07 23:22 ` [PATCH A 05/12] net: fec: remove checking for NULL phy_dev in fec_enet_close() Russell King
2014-07-07 23:22   ` Russell King
2014-07-07 23:22 ` [PATCH A 06/12] net: fec: ensure that a disconnected phy isn't configured Russell King
2014-07-07 23:22   ` Russell King
2014-07-07 23:23 ` [PATCH A 07/12] net: fec: stop the phy before shutting down the MAC Russell King
2014-07-07 23:23   ` Russell King
2014-07-07 23:23 ` [PATCH A 08/12] net: fec: remove useless fep->opened Russell King
2014-07-07 23:23   ` Russell King
2014-07-07 23:23 ` [PATCH A 09/12] net: fec: make rx skb handling more robust Russell King
2014-07-07 23:23   ` Russell King
2014-07-07 23:23 ` [PATCH A 10/12] net: fec: clean up transmit descriptor setup Russell King
2014-07-07 23:23   ` Russell King
2014-07-07 23:23 ` [PATCH A 11/12] net: fec: ensure fec_enet_free_buffers() properly cleans the rings Russell King
2014-07-07 23:23   ` Russell King
2014-07-07 23:23 ` Russell King [this message]
2014-07-07 23:23   ` [PATCH A 12/12] net: fec: fix missing kmalloc() failure check in fec_enet_alloc_buffers() Russell King
2014-07-08  4:22 ` [PATCH A 00/12] Freescale ethernet driver updates David Miller
2014-07-08  4:22   ` David Miller

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