net: fix network driver ndo_start_xmit() return values (part 1)

Fix up drivers that return an errno value to qdisc_restart(), causing
qdisc_restart() to print a warning and requeue/retransmit the skb.

- xpnet: memory allocation error, intention is to drop
- ethoc: oversized packet, packet must be dropped
- ibmlana: skb freed: use after free
- rrunner: skb freed: use after free

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/misc/sgi-xp/xpnet.c b/drivers/misc/sgi-xp/xpnet.c
index 6faefcf..8d1c60a 100644 (file)
--- a/drivers/misc/sgi-xp/xpnet.c
+++ b/drivers/misc/sgi-xp/xpnet.c
@@ -450,7 +450,8 @@ xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
                         "packet\n", sizeof(struct xpnet_pending_msg));
 
                dev->stats.tx_errors++;
-               return -ENOMEM;
+               dev_kfree_skb(skb);
+               return NETDEV_TX_OK;
        }
 
        /* get the beginning of the first cacheline and end of last */

diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
index 91a9b1a..ceb6a9c 100644 (file)
--- a/drivers/net/ethoc.c
+++ b/drivers/net/ethoc.c
@@ -811,7 +811,7 @@ static int ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
        if (unlikely(skb->len > ETHOC_BUFSIZ)) {
                priv->stats.tx_errors++;
-               return -EMSGSIZE;
+               goto out;
        }
 
        entry = priv->cur_tx % priv->num_tx;
@@ -840,9 +840,9 @@ static int ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
        }
 
        dev->trans_start = jiffies;
-       dev_kfree_skb(skb);
-
        spin_unlock_irq(&priv->lock);
+out:
+       dev_kfree_skb(skb);
        return NETDEV_TX_OK;
 }
 

diff --git a/drivers/net/ibmlana.c b/drivers/net/ibmlana.c
index c25bc0b..448098d 100644 (file)
--- a/drivers/net/ibmlana.c
+++ b/drivers/net/ibmlana.c
@@ -815,7 +815,7 @@ static int ibmlana_close(struct net_device *dev)
 static int ibmlana_tx(struct sk_buff *skb, struct net_device *dev)
 {
        ibmlana_priv *priv = netdev_priv(dev);
-       int retval = 0, tmplen, addr;
+       int tmplen, addr;
        unsigned long flags;
        tda_t tda;
        int baddr;
@@ -824,7 +824,6 @@ static int ibmlana_tx(struct sk_buff *skb, struct net_device *dev)
           the upper layer is in deep desperation and we simply ignore the frame. */
 
        if (priv->txusedcnt >= TXBUFCNT) {
-               retval = -EIO;
                dev->stats.tx_dropped++;
                goto tx_done;
        }
@@ -874,7 +873,7 @@ static int ibmlana_tx(struct sk_buff *skb, struct net_device *dev)
        spin_unlock_irqrestore(&priv->lock, flags);
 tx_done:
        dev_kfree_skb(skb);
-       return retval;
+       return NETDEV_TX_OK;
 }
 
 /* switch receiver mode. */

diff --git a/drivers/net/rrunner.c b/drivers/net/rrunner.c
index d890829..81dbcbb 100644 (file)
--- a/drivers/net/rrunner.c
+++ b/drivers/net/rrunner.c
@@ -1425,7 +1425,7 @@ static int rr_start_xmit(struct sk_buff *skb, struct net_device *dev)
                if (!(new_skb = dev_alloc_skb(len + 8))) {
                        dev_kfree_skb(skb);
                        netif_wake_queue(dev);
-                       return -EBUSY;
+                       return NETDEV_TX_OK;
                }
                skb_reserve(new_skb, 8);
                skb_put(new_skb, len);