4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tiwei Bie <tiwei.bie@xxxxxxxxx>
commit e82df670235138575b37ff0ec24412a471efd97f upstream.
The vq->vq.num_free hasn't been changed when error happens,
so it shouldn't be changed when handling the error.
Fixes: 780bc7903a32 ("virtio_ring: Support DMA APIs")
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Tiwei Bie <tiwei.bie@xxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/virtio/virtio_ring.c | 2 --
1 file changed, 2 deletions(-)
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -423,8 +423,6 @@ unmap_release:
i = vq->vring.desc[i].next;
}
- vq->vq.num_free += total_sg;
-
if (indirect)
kfree(desc);