The more_used() function compares the vq->vring.used->idx with last_used_idx. Since vq->vring.used->idx is a 16-bit integer, and last_used_idx is an unsigned int, this results in unpredictable behavior when vq->vring.used->idx wraps around. This patch corrects this by changing last_used_idx to the correct type. Signed-off-by: Anthony Liguori <aliguori@xxxxxxxxxx> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 0e4baca..0e1bf05 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -53,7 +53,7 @@ struct vring_virtqueue unsigned int num_added; /* Last used index we've seen. */ - unsigned int last_used_idx; + u16 last_used_idx; /* How to notify other side. FIXME: commonalize hcalls! */ void (*notify)(struct virtqueue *vq); _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
