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xen-netfront: Avoid deref'ing skbafter it is potentially freed. 

xennet_tx_bug_gc can free the skb before we use it, so make sure we don't.

Signed-off-by: Keir Fraser <keir@xensource.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jeremy Fitzhardinge 2007-08-13 12:54:37 -07:00 committed by Jeff Garzik
parent a6d89915aa
commit 10a273a673
1 changed files with 4 additions and 3 deletions
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7
drivers/net/xen-netfront.c
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@ -566,6 +566,10 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (notify) if (notify)
notify_remote_via_irq(np->netdev->irq); notify_remote_via_irq(np->netdev->irq);
np->stats.tx_bytes += skb->len;
np->stats.tx_packets++;
/* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
xennet_tx_buf_gc(dev); xennet_tx_buf_gc(dev);
if (!netfront_tx_slot_available(np)) if (!netfront_tx_slot_available(np))
@ -573,9 +577,6 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
spin_unlock_irq(&np->tx_lock); spin_unlock_irq(&np->tx_lock);
np->stats.tx_bytes += skb->len;
np->stats.tx_packets++;
return 0; return 0;
drop: drop: