linux-kernel - [PATCH] net s2io: return on NULL dev_alloc

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Date:	Mon, 30 Oct 2006 14:19:25 -0800 (PST)
From:	David Rientjes <rientjes@...washington.edu>
To:	akpm@...l.org
cc:	jgarzik@...ox.com, hch@...rared.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net s2io: return on NULL dev_alloc_skb()

Checks for NULL dev_alloc_skb() and returns on true to avoid subsequent
dereference.

Cc: Jeff Garzik <jgarzik@...ox.com>
Cc: Christoph Hellwig <hch@...rared.org>
Signed-off-by: David Rientjes <rientjes@...washington.edu>
---
 drivers/net/s2io.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index a231ab7..33569ec 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -5985,6 +5985,11 @@ static int set_rxd_buffer_pointer(nic_t 
 			((RxD3_t*)rxdp)->Buffer1_ptr = *temp1;
 		} else {
 			*skb = dev_alloc_skb(size);
+			if (!(*skb)) {
+				DBG_PRINT(ERR_DBG, "%s: dev_alloc_skb failed\n",
+					  dev->name);
+				return -ENOMEM;
+			}
 			((RxD3_t*)rxdp)->Buffer2_ptr = *temp2 =
 				pci_map_single(sp->pdev, (*skb)->data,
 					       dev->mtu + 4,
@@ -6007,7 +6012,11 @@ static int set_rxd_buffer_pointer(nic_t 
 			((RxD3_t*)rxdp)->Buffer2_ptr = *temp2;
 		} else {
 			*skb = dev_alloc_skb(size);
-
+			if (!(*skb)) {
+				DBG_PRINT(ERR_DBG, "%s: dev_alloc_skb failed\n",
+					  dev->name);
+				return -ENOMEM;
+			}
 			((RxD3_t*)rxdp)->Buffer0_ptr = *temp0 =
 				pci_map_single(sp->pdev, ba->ba_0, BUF0_LEN,
 					       PCI_DMA_FROMDEVICE);
-
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