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SubjectRe: [PATCH V4 4/5] virtio: introduce a vDPA based transport
Date
On Thu, Feb 20, 2020 at 02:11:40PM +0800, Jason Wang wrote:
> +static int virtio_vdpa_probe(struct vdpa_device *vdpa)
> +{
> + const struct vdpa_config_ops *ops = vdpa->config;
> + struct virtio_vdpa_device *vd_dev;
> + int ret = -EINVAL;
> +
> + vd_dev = kzalloc(sizeof(*vd_dev), GFP_KERNEL);
> + if (!vd_dev)
> + return -ENOMEM;
> +
> + vd_dev->vdev.dev.parent = vdpa_get_dma_dev(vdpa);
> + vd_dev->vdev.dev.release = virtio_vdpa_release_dev;
> + vd_dev->vdev.config = &virtio_vdpa_config_ops;
> + vd_dev->vdpa = vdpa;
> + INIT_LIST_HEAD(&vd_dev->virtqueues);
> + spin_lock_init(&vd_dev->lock);
> +
> + vd_dev->vdev.id.device = ops->get_device_id(vdpa);
> + if (vd_dev->vdev.id.device == 0)
> + goto err;
> +
> + vd_dev->vdev.id.vendor = ops->get_vendor_id(vdpa);
> + ret = register_virtio_device(&vd_dev->vdev);
> + if (ret)
> + goto err;

This error unwind is wrong. register_virtio_device() does
device_initialize() as it's first action. After that point error
unwind must be done with put_device() - particularly calling
kfree(vd_dev) after doing dev_set_name() leaks memory.

Looks like about half of the register_virtio_device() users did this
right, the others not. Perhaps you should fix them too...

Jason

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