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qemu: avoid memory leak while remove disk

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Memset vhost_dev to zero in the vhost_dev_cleanup function.
This causes dev.vqs to be NULL, so that
vqs does not free up space when calling the g_free function.
This will result in a memory leak. But you can't release vqs
directly in the vhost_dev_cleanup function, because vhost_net
will also call this function, and vhost_net's vqs is assigned by array.
In order to solve this problem, we first save the pointer of vqs,
and release the space of vqs after vhost_dev_cleanup is called.

Signed-off-by: Jian Wang <wangjian161@huawei.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jian Wang 2018-12-22 18:27:28 +08:00 committed by Michael S. Tsirkin
parent 5a0e75f0a9
commit a5390d9367
3 changed files with 9 additions and 4 deletions
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7
hw/block/vhost-user-blk.c
View file

@ -250,6 +250,7 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserBlk *s = VHOST_USER_BLK(vdev);
VhostUserState *user;
struct vhost_virtqueue *vqs = NULL;
int i, ret;
if (!s->chardev.chr) {
@ -288,6 +289,7 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
s->dev.vq_index = 0;
s->dev.backend_features = 0;
vqs = s->dev.vqs;
vhost_dev_set_config_notifier(&s->dev, &blk_ops);
@ -314,7 +316,7 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
vhost_err:
vhost_dev_cleanup(&s->dev);
virtio_err:
g_free(s->dev.vqs);
g_free(vqs);
virtio_cleanup(vdev);
vhost_user_cleanup(user);
@ -326,10 +328,11 @@ static void vhost_user_blk_device_unrealize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserBlk *s = VHOST_USER_BLK(dev);
struct vhost_virtqueue *vqs = s->dev.vqs;
vhost_user_blk_set_status(vdev, 0);
vhost_dev_cleanup(&s->dev);
g_free(s->dev.vqs);
g_free(vqs);
virtio_cleanup(vdev);
if (s->vhost_user) {

3
hw/scsi/vhost-scsi.c
View file

@ -215,6 +215,7 @@ static void vhost_scsi_unrealize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
struct vhost_virtqueue *vqs = vsc->dev.vqs;
migrate_del_blocker(vsc->migration_blocker);
error_free(vsc->migration_blocker);
@ -223,7 +224,7 @@ static void vhost_scsi_unrealize(DeviceState *dev, Error **errp)
vhost_scsi_set_status(vdev, 0);
vhost_dev_cleanup(&vsc->dev);
g_free(vsc->dev.vqs);
g_free(vqs);
virtio_scsi_common_unrealize(dev, errp);
}

3
hw/scsi/vhost-user-scsi.c
View file

@ -121,12 +121,13 @@ static void vhost_user_scsi_unrealize(DeviceState *dev, Error **errp)
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserSCSI *s = VHOST_USER_SCSI(dev);
VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
struct vhost_virtqueue *vqs = vsc->dev.vqs;
/* This will stop the vhost backend. */
vhost_user_scsi_set_status(vdev, 0);
vhost_dev_cleanup(&vsc->dev);
g_free(vsc->dev.vqs);
g_free(vqs);
virtio_scsi_common_unrealize(dev, errp);