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Message-Id: <20200210122431.167308054@linuxfoundation.org>
Date: Mon, 10 Feb 2020 04:33:32 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Wei Wang <wei.w.wang@...el.com>,
Liang Li <liang.z.li@...el.com>,
David Hildenbrand <david@...hat.com>
Subject: [PATCH 5.4 256/309] virtio-balloon: Fix memory leak when unloading while hinting is in progress
From: David Hildenbrand <david@...hat.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@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Wei Wang <wei.w.wang@...el.com>
Cc: Liang Li <liang.z.li@...el.com>
Signed-off-by: David Hildenbrand <david@...hat.com>
Link: https://lore.kernel.org/r/20200205163402.42627-2-david@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/virtio/virtio_balloon.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -967,6 +967,10 @@ 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);
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