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virtio_serial: check the host to guest buffer nums #244

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May 6, 2024
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virtio_serial: check the host to guest buffer nums #244

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7 changes: 6 additions & 1 deletion src/devices/virtio_serial/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -762,7 +762,12 @@ impl VirtioSerial {
.borrow_mut()
.pop_used(&mut g2h, &mut h2g)?;

*self.receive_queues_prefill.index_mut(queue_idx / 2) -= h2g.len();
let prefill_num = self.receive_queues_prefill.index_mut(queue_idx / 2);
if *prefill_num < h2g.len() {
return Err(VirtioSerialError::Device);
}
*prefill_num -= h2g.len();

self.receive_data(port_id, &h2g, len)?;
self.fill_port_queue(port_id)?;

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