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authorDavid S. Miller <davem@davemloft.net>2014-01-02 19:50:52 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-15 15:28:50 -0800
commit50ba56ca77a62c3bc36ba9bde7bffecc63c30477 (patch)
tree65145b4dfd5494de20319b98ba87aaa2a23e3c5c /net
parente7c28ed53545ee8972baf31c89a4e801be228e99 (diff)
downloadlinaro-lsk-50ba56ca77a62c3bc36ba9bde7bffecc63c30477.tar.gz
netpoll: Fix missing TXQ unlock and and OOPS.
[ Upstream commit aca5f58f9ba803ec8c2e6bcf890db17589e8dfcc ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/core/netpoll.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index b04f73847ed..27f33f25cda 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -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)