diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2014-10-15 16:23:28 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-15 16:47:45 -0400 |
| commit | 4b7fd2e688d51f8ed7380758047fcaa4d4693d47 (patch) | |
| tree | e4e32b6121ab17b8b21aac673a69e16bace31c28 /drivers/net/virtio_net.c | |
| parent | 28b5f058cf1d268d965894ce42a614d13f853dd6 (diff) | |
virtio_net: fix use after free
commit 0b725a2ca61bedc33a2a63d0451d528b268cf975
net: Remove ndo_xmit_flush netdev operation, use signalling instead.
added code that looks at skb->xmit_more after the skb has
been put in TX VQ. Since some paths process the ring and free the skb
immediately, this can cause use after free.
Fix by storing xmit_more in a local variable.
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/virtio_net.c')
| -rw-r--r-- | drivers/net/virtio_net.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 3d0ce4468ce6..13d0a8bc8bf3 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -920,6 +920,8 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) int qnum = skb_get_queue_mapping(skb); struct send_queue *sq = &vi->sq[qnum]; int err; + struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); + bool kick = !skb->xmit_more; /* Free up any pending old buffers before queueing new ones. */ free_old_xmit_skbs(sq); @@ -956,7 +958,7 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) } } - if (__netif_subqueue_stopped(dev, qnum) || !skb->xmit_more) + if (kick || netif_xmit_stopped(txq)) virtqueue_kick(sq->vq); return NETDEV_TX_OK; |