virtio_net: fix use after free
commit 0b725a2c 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>
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