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vhost: Use vhost_get_used_size() in vhost_vring_set_addr()

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commit 71878fa46c7e3b40fa7b3f1b6e4ba3f92f1ac359 upstream.

The open-coded computation of the used size doesn't take the event
into account when the VIRTIO_RING_F_EVENT_IDX feature is present.
Fix that by using vhost_get_used_size().

Fixes: 8ea8cf89e1 ("vhost: support event index")
Cc: [email protected]
Signed-off-by: Greg Kurz <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Greg Kurz 2020-10-03 12:02:03 +02:00 • committed by Greg Kroah-Hartman
commit 920a61ddd3
1 changed files with 1 additions and 2 deletions
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3
drivers/vhost/vhost.c
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@ -1545,8 +1545,7 @@ static long vhost_vring_set_addr(struct vhost_dev *d,
/* Also validate log access for used ring if enabled. */
if ((a.flags & (0x1 << VHOST_VRING_F_LOG)) &&
!log_access_ok(vq->log_base, a.log_guest_addr,
sizeof *vq->used +
vq->num * sizeof *vq->used->ring))
vhost_get_used_size(vq, vq->num)))
return -EINVAL;
}