9p/trans_virtio: discard zero-length reply
When a 9p request is successfully flushed, the server is expected to just mark it as used without sending a 9p reply (ie, without writing data into the buffer). In this case, virtqueue_get_buf() will return len == 0 and we must not report a REQ_STATUS_RCVD status to the client, otherwise the client will erroneously assume the request has not been flushed. Cc: stable@vger.kernel.org Signed-off-by:Greg Kurz <groug@kaod.org> Signed-off-by:
Michael S. Tsirkin <mst@redhat.com>
parent
d25cc43c
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