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authorDavid Hildenbrand <david@redhat.com>2020-02-05 19:34:00 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-02-06 11:40:26 +0300
commit6c22dc61c76b7e7d355f1697ba0ecf26d1334ba6 (patch)
tree6b85e47f905472c5a1e1c5c54d9391936562fd7a /drivers/virtio/virtio_balloon.c
parent6e9826e77249355c09db6ba41cd3f84e89f4b614 (diff)
downloadlinux-6c22dc61c76b7e7d355f1697ba0ecf26d1334ba6.tar.xz
virtio-balloon: Fix memory leak when unloading while hinting is in progress
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>
Diffstat (limited to 'drivers/virtio/virtio_balloon.c')
-rw-r--r--drivers/virtio/virtio_balloon.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 2457c54b6185..6d063eeaa08a 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -970,6 +970,10 @@ static void remove_common(struct virtio_balloon *vb)
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);