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irda: fix a race in irlan_eth_xmit() 

After skb is queued, its illegal to dereference it.

Cache skb->len into a temporary variable.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-08-18 00:24:43 +00:00 committed by David S. Miller
parent 9c38657cfc
commit 79c5f51c63
1 changed files with 3 additions and 1 deletions
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4
net/irda/irlan/irlan_eth.c
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@ -169,6 +169,7 @@ static netdev_tx_t irlan_eth_xmit(struct sk_buff *skb,
{
struct irlan_cb *self = netdev_priv(dev);
int ret;
unsigned int len;
/* skb headroom large enough to contain all IrDA-headers? */
if ((skb_headroom(skb) < self->max_header_size) || (skb_shared(skb))) {
@ -188,6 +189,7 @@ static netdev_tx_t irlan_eth_xmit(struct sk_buff *skb,
dev->trans_start = jiffies;
len = skb->len;
/* Now queue the packet in the transport layer */
if (self->use_udata)
ret = irttp_udata_request(self->tsap_data, skb);
@ -209,7 +211,7 @@ static netdev_tx_t irlan_eth_xmit(struct sk_buff *skb,
self->stats.tx_dropped++;
} else {
self->stats.tx_packets++;
self->stats.tx_bytes += skb->len;
self->stats.tx_bytes += len;
}
return NETDEV_TX_OK;