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9p/trans_virtio: discard zero-length reply
commit 26d99834f8
upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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@ -160,7 +160,8 @@ static void req_done(struct virtqueue *vq)
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spin_unlock_irqrestore(&chan->lock, flags);
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/* Wakeup if anyone waiting for VirtIO ring space. */
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wake_up(chan->vc_wq);
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p9_client_cb(chan->client, req, REQ_STATUS_RCVD);
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if (len)
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p9_client_cb(chan->client, req, REQ_STATUS_RCVD);
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}
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}
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