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netpoll: Fix missing TXQ unlock and and OOPS. 

The VLAN tag handling code in netpoll_send_skb_on_dev() has two problems.

1) It exits without unlocking the TXQ.

2) It then tries to queue a NULL skb to npinfo->txq.

Reported-by: Ahmed Tamrawi <atamrawi@iastate.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-01-02 19:50:52 -05:00
parent 469bdcefdc
commit aca5f58f9b
1 changed files with 9 additions and 2 deletions
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11
net/core/netpoll.c
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@ -386,8 +386,14 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
!vlan_hw_offload_capable(netif_skb_features(skb),
skb->vlan_proto)) {
skb = __vlan_put_tag(skb, skb->vlan_proto, vlan_tx_tag_get(skb));
if (unlikely(!skb))
break;
if (unlikely(!skb)) {
/* This is actually a packet drop, but we
* don't want the code at the end of this
* function to try and re-queue a NULL skb.
*/
status = NETDEV_TX_OK;
goto unlock_txq;
}
skb->vlan_tci = 0;
}
@ -395,6 +401,7 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
if (status == NETDEV_TX_OK)
txq_trans_update(txq);
}
unlock_txq:
__netif_tx_unlock(txq);
if (status == NETDEV_TX_OK)