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virtio: Protect vqs list access

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[ Upstream commit 0e566c8f0f2e8325e35f6f97e13cde5356b41814 ]

VQs may be accessed to mark the device broken while they are
created/destroyed. Hence protect the access to the vqs list.

Fixes: e2dcdfe95c ("virtio: virtio_break_device() to mark all virtqueues broken.")
Signed-off-by: Parav Pandit <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Parav Pandit 2021-07-21 17:26:47 +03:00 • committed by Sasha Levin
commit b9a59636c4
3 changed files with 10 additions and 0 deletions
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1
drivers/virtio/virtio.c
View file

@ -342,6 +342,7 @@ int register_virtio_device(struct virtio_device *dev)
virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
INIT_LIST_HEAD(&dev->vqs);
spin_lock_init(&dev->vqs_list_lock);
/*
* device_add() causes the bus infrastructure to look for a matching

8
drivers/virtio/virtio_ring.c
View file

@ -1668,7 +1668,9 @@ static struct virtqueue *vring_create_virtqueue_packed(
cpu_to_le16(vq->packed.event_flags_shadow);
}
spin_lock(&vdev->vqs_list_lock);
list_add_tail(&vq->vq.list, &vdev->vqs);
spin_unlock(&vdev->vqs_list_lock);
return &vq->vq;
err_desc_extra:
@ -2126,7 +2128,9 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
memset(vq->split.desc_state, 0, vring.num *
sizeof(struct vring_desc_state_split));
spin_lock(&vdev->vqs_list_lock);
list_add_tail(&vq->vq.list, &vdev->vqs);
spin_unlock(&vdev->vqs_list_lock);
return &vq->vq;
}
EXPORT_SYMBOL_GPL(__vring_new_virtqueue);
@ -2210,7 +2214,9 @@ void vring_del_virtqueue(struct virtqueue *_vq)
}
if (!vq->packed_ring)
kfree(vq->split.desc_state);
spin_lock(&vq->vq.vdev->vqs_list_lock);
list_del(&_vq->list);
spin_unlock(&vq->vq.vdev->vqs_list_lock);
kfree(vq);
}
EXPORT_SYMBOL_GPL(vring_del_virtqueue);
@ -2274,10 +2280,12 @@ void virtio_break_device(struct virtio_device *dev)
{
struct virtqueue *_vq;
spin_lock(&dev->vqs_list_lock);
list_for_each_entry(_vq, &dev->vqs, list) {
struct vring_virtqueue *vq = to_vvq(_vq);
vq->broken = true;
}
spin_unlock(&dev->vqs_list_lock);
}
EXPORT_SYMBOL_GPL(virtio_break_device);