tree cb26b7adfe4c8af39361716966049ed8dd4732d0
parent d399cf8c04c595d738d82d02ae2755b902a51571
author Rusty Russell <rusty@rustcorp.com.au> 1211787762 +1000
committer Jeff Garzik <jgarzik@redhat.com> 1212199640 -0400

virtio: fix virtio_net xmit of freed skb bug

If we fail to transmit a packet, we assume the queue is full and put
the skb into last_xmit_skb.  However, if more space frees up before we
xmit it, we loop, and the result can be transmitting the same skb twice.

Fix is simple: set skb to NULL if we've used it in some way, and check
before sending.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>