linux-kernel - Re: [PATCH] virtio-mmio: fix missing put_device() when vm_cmdline

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Date:   Wed, 8 Jun 2022 16:11:31 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     chengkaitao <pilgrimtao@...il.com>
Cc:     mst <mst@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>, smcdef@...il.com
Subject: Re: [PATCH] virtio-mmio: fix missing put_device() when
 vm_cmdline_parent registration failed

On Thu, Jun 2, 2022 at 9:12 AM chengkaitao <pilgrimtao@...il.com> wrote:
>
> From: chengkaitao <pilgrimtao@...il.com>
>
> The reference must be released when device_register(&vm_cmdline_parent)
> failed. Add the corresponding 'put_device()' in the error handling path.
>
> Signed-off-by: chengkaitao <pilgrimtao@...il.com>

Acked-by: Jason Wang <jasowang@...hat.com>

> ---
>  drivers/virtio/virtio_mmio.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 56128b9c46eb..1dd396d4bebb 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -688,6 +688,7 @@ static int vm_cmdline_set(const char *device,
>         if (!vm_cmdline_parent_registered) {
>                 err = device_register(&vm_cmdline_parent);
>                 if (err) {
> +                       put_device(&vm_cmdline_parent);
>                         pr_err("Failed to register parent device!\n");
>                         return err;
>                 }
> --
> 2.14.1
>