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SubjectRe: [PATCH v1 2/3] virtio_balloon: Fix memory leaks on errors in virtballoon_probe()
On Wed, Feb 05, 2020 at 05:34:01PM +0100, David Hildenbrand wrote:
> We forget to put the inode and unmount the kernfs used for compaction.
>
> Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker")
> 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>

Applied, thanks!

> ---
> drivers/virtio/virtio_balloon.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> index abef2306c899..7e5d84caeb94 100644
> --- a/drivers/virtio/virtio_balloon.c
> +++ b/drivers/virtio/virtio_balloon.c
> @@ -901,8 +901,7 @@ static int virtballoon_probe(struct virtio_device *vdev)
> vb->vb_dev_info.inode = alloc_anon_inode(balloon_mnt->mnt_sb);
> if (IS_ERR(vb->vb_dev_info.inode)) {
> err = PTR_ERR(vb->vb_dev_info.inode);
> - kern_unmount(balloon_mnt);
> - goto out_del_vqs;
> + goto out_kern_unmount;
> }
> vb->vb_dev_info.inode->i_mapping->a_ops = &balloon_aops;
> #endif
> @@ -913,13 +912,13 @@ static int virtballoon_probe(struct virtio_device *vdev)
> */
> if (virtqueue_get_vring_size(vb->free_page_vq) < 2) {
> err = -ENOSPC;
> - goto out_del_vqs;
> + goto out_iput;
> }
> vb->balloon_wq = alloc_workqueue("balloon-wq",
> WQ_FREEZABLE | WQ_CPU_INTENSIVE, 0);
> if (!vb->balloon_wq) {
> err = -ENOMEM;
> - goto out_del_vqs;
> + goto out_iput;
> }
> INIT_WORK(&vb->report_free_page_work, report_free_page_func);
> vb->cmd_id_received_cache = VIRTIO_BALLOON_CMD_ID_STOP;
> @@ -953,6 +952,12 @@ static int virtballoon_probe(struct virtio_device *vdev)
> out_del_balloon_wq:
> if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT))
> destroy_workqueue(vb->balloon_wq);
> +out_iput:
> +#ifdef CONFIG_BALLOON_COMPACTION
> + iput(vb->vb_dev_info.inode);
> +out_kern_unmount:
> + kern_unmount(balloon_mnt);
> +#endif
> out_del_vqs:
> vdev->config->del_vqs(vdev);
> out_free_vb:
> --
> 2.24.1

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