diff options
| -rw-r--r-- | devices/src/virtio/queue.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/devices/src/virtio/queue.rs b/devices/src/virtio/queue.rs index 153449a..21cf63e 100644 --- a/devices/src/virtio/queue.rs +++ b/devices/src/virtio/queue.rs @@ -317,6 +317,8 @@ impl Queue { let queue_size = self.actual_size(); let avail_index_addr = mem.checked_offset(self.avail_ring, 2).unwrap(); let avail_index: u16 = mem.read_obj_from_addr(avail_index_addr).unwrap(); + // make sure desc_index read doesn't bypass avail_index read + fence(Ordering::Acquire); let avail_len = Wrapping(avail_index) - self.next_avail; if avail_len.0 > queue_size || self.next_avail == Wrapping(avail_index) { |