Subject: Re: [PATCH v2] virtio_net: Fix probe failed when modprobe virtio_net

From: "Michael S. Tsirkin" <[email-masked]>
Date: Tue, 22 Nov 2022 15:06:43 -0500

On Tue, Nov 22, 2022 at 11:00:46PM +0800, Li Zetao wrote:
> When doing the following test steps, an error was found:
>   step 1: modprobe virtio_net succeeded
>     # modprobe virtio_net        <-- OK
> 
>   step 2: fault injection in register_netdevice()
>     # modprobe -r virtio_net     <-- OK
>     # ...
>       FAULT_INJECTION: forcing a failure.
>       name failslab, interval 1, probability 0, space 0, times 0
>       CPU: 0 PID: 3521 Comm: modprobe
>       Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>       Call Trace:
>        <TASK>
>        ...
>        should_failslab+0xa/0x20
>        ...
>        dev_set_name+0xc0/0x100
>        netdev_register_kobject+0xc2/0x340
>        register_netdevice+0xbb9/0x1320
>        virtnet_probe+0x1d72/0x2658 [virtio_net]
>        ...
>        </TASK>
>       virtio_net: probe of virtio0 failed with error -22
> 
>   step 3: modprobe virtio_net failed
>     # modprobe virtio_net        <-- failed
>       virtio_net: probe of virtio0 failed with error -2
> 
> The root cause of the problem is that the queues are not
> disable

if you need to resend it:

not disabled

but that's minor, ok to ignore

> on the error handling path when register_netdevice()
> fails in virtnet_probe(), resulting in an error "-ENOENT"
> returned in the next modprobe call in setup_vq().
> 
> virtio_pci_modern_device uses virtqueues to send or
> receive message, and "queue_enable" records whether the
> queues are available. In vp_modern_find_vqs(), all queues
> will be selected and activated, but once queues are enabled
> there is no way to go back except reset.
> 
> Fix it by reset virtio device on error handling path. This
> makes error handling follow the same order as normal device
> cleanup in virtnet_remove() which does: unregister, destroy
> failover, then reset. And that flow is better tested than
> error handling so we can be reasonably sure it works well.
> 
> Fixes: 024655555021 ("virtio_net: fix use after free on allocation failure")
> Signed-off-by: Li Zetao <[email-masked]>
> Acked-by: Michael S. Tsirkin <[email-masked]>

Thanks, LGTM, feel free to merge.

> ---
> v1 was posted at: https://lore.kernel.org/all/[email-masked]/
> v1 -> v2: modify commit log and fixes tag
> 
>  drivers/net/virtio_net.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 7106932c6f88..86e52454b5b5 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -3949,12 +3949,11 @@ static int virtnet_probe(struct virtio_device *vdev)
>  	return 0;
>  
>  free_unregister_netdev:
> -	virtio_reset_device(vdev);
> -
>  	unregister_netdev(dev);
>  free_failover:
>  	net_failover_destroy(vi->failover);
>  free_vqs:
> +	virtio_reset_device(vdev);
>  	cancel_delayed_work_sync(&vi->refill);
>  	free_receive_page_frags(vi);
>  	virtnet_del_vqs(vi);
> -- 
> 2.25.1