[PATCH] net/virtio-user: fix leak when initialisation fails

[Maxime Coquelin]

On 4/13/23 12:10, David Marchand wrote:
> Caught with ASan.
> If initialising a virtio_user port fails, we may leak the ifname passed
> via a devargs.
> 
> Fixes: 4214a1b493f2 ("net/virtio-user: support changing tap interface name")
> Cc: stable at dpdk.org
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---
>   drivers/net/virtio/virtio_user/virtio_user_dev.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> index f46a131b5c..744f3c30d2 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -696,11 +696,7 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char *path, uint16_t queues,
>   	dev->frontend_features = 0;
>   	dev->unsupported_features = 0;
>   	dev->backend_type = backend_type;
> -
> -	if (*ifname) {
> -		dev->ifname = *ifname;
> -		*ifname = NULL;
> -	}
> +	dev->ifname = *ifname;
>   
>   	if (virtio_user_dev_setup(dev) < 0) {
>   		PMD_INIT_LOG(ERR, "(%s) backend set up fails", dev->path);
> @@ -794,6 +790,7 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char *path, uint16_t queues,
>   		}
>   	}
>   
> +	*ifname = NULL;
>   	return 0;
>   
>   notify_uninit:

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime