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authorPhil Sutter <n0-1@freewrt.org>2009-08-12 12:52:32 +0000
committerDavid S. Miller <davem@davemloft.net>2009-08-13 16:26:12 -0700
commit7010837a44813711b66d9e82e90f9641464e515d (patch)
tree6d6aab73dd5af93db3f3ef1fa69b5e95688171c9 /drivers/net/korina.c
parentf16aea4d201018a124f3c1efd7f247fd3b11e4e1 (diff)
korina: add error-handling to korina_alloc_ring
This also avoids a potential buffer overflow in case the very first receive descriptor fails to allocate, as an index of -1 would be used afterwards. Kudos to Roel Kluin for pointing this out and providing an initial patch. Signed-off-by: Phil Sutter <n0-1@freewrt.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/korina.c')
-rw-r--r--drivers/net/korina.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/net/korina.c b/drivers/net/korina.c
index 6df9d253cc0..51ca54c8ec5 100644
--- a/drivers/net/korina.c
+++ b/drivers/net/korina.c
@@ -750,7 +750,7 @@ static struct ethtool_ops netdev_ethtool_ops = {
.get_link = netdev_get_link,
};
-static void korina_alloc_ring(struct net_device *dev)
+static int korina_alloc_ring(struct net_device *dev)
{
struct korina_private *lp = netdev_priv(dev);
struct sk_buff *skb;
@@ -771,7 +771,7 @@ static void korina_alloc_ring(struct net_device *dev)
for (i = 0; i < KORINA_NUM_RDS; i++) {
skb = dev_alloc_skb(KORINA_RBSIZE + 2);
if (!skb)
- break;
+ return -ENOMEM;
skb_reserve(skb, 2);
lp->rx_skb[i] = skb;
lp->rd_ring[i].control = DMA_DESC_IOD |
@@ -790,6 +790,8 @@ static void korina_alloc_ring(struct net_device *dev)
lp->rx_chain_head = 0;
lp->rx_chain_tail = 0;
lp->rx_chain_status = desc_empty;
+
+ return 0;
}
static void korina_free_ring(struct net_device *dev)
@@ -832,7 +834,11 @@ static int korina_init(struct net_device *dev)
writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc);
/* Allocate rings */
- korina_alloc_ring(dev);
+ if (korina_alloc_ring(dev)) {
+ printk(KERN_ERR "%s: descriptor allocation failed\n", dev->name);
+ korina_free_ring(dev);
+ return -ENOMEM;
+ }
writel(0, &lp->rx_dma_regs->dmas);
/* Start Rx DMA */