| From 6c22dc61c76b7e7d355f1697ba0ecf26d1334ba6 Mon Sep 17 00:00:00 2001 |
| From: David Hildenbrand <david@redhat.com> |
| Date: Wed, 5 Feb 2020 17:34:00 +0100 |
| Subject: virtio-balloon: Fix memory leak when unloading while hinting is in progress |
| |
| From: David Hildenbrand <david@redhat.com> |
| |
| commit 6c22dc61c76b7e7d355f1697ba0ecf26d1334ba6 upstream. |
| |
| When unloading the driver while hinting is in progress, we will not |
| release the free page blocks back to MM, resulting in a memory leak. |
| |
| Fixes: 86a559787e6f ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT") |
| Cc: "Michael S. Tsirkin" <mst@redhat.com> |
| Cc: Jason Wang <jasowang@redhat.com> |
| Cc: Wei Wang <wei.w.wang@intel.com> |
| Cc: Liang Li <liang.z.li@intel.com> |
| Signed-off-by: David Hildenbrand <david@redhat.com> |
| Link: https://lore.kernel.org/r/20200205163402.42627-2-david@redhat.com |
| Signed-off-by: Michael S. Tsirkin <mst@redhat.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/virtio/virtio_balloon.c | 4 ++++ |
| 1 file changed, 4 insertions(+) |
| |
| --- a/drivers/virtio/virtio_balloon.c |
| +++ b/drivers/virtio/virtio_balloon.c |
| @@ -968,6 +968,10 @@ static void remove_common(struct virtio_ |
| leak_balloon(vb, vb->num_pages); |
| update_balloon_size(vb); |
| |
| + /* There might be free pages that are being reported: release them. */ |
| + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) |
| + return_free_pages_to_mm(vb, ULONG_MAX); |
| + |
| /* Now we reset the device so we can clean up the queues. */ |
| vb->vdev->config->reset(vb->vdev); |
| |
