linux-kernel - Re: [PATCH v4 1/3] vdpa: Fix error logic in vdpa_nl_cmd_dev_get

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Message-ID: <CACGkMEs35nLewkMzP0p4mBHtiYb0DQaMmnG_EEpUad18ygnqxg@mail.gmail.com>
Date:   Tue, 10 May 2022 10:40:44 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eli Cohen <elic@...dia.com>
Cc:     mst <mst@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Si-Wei Liu <si-wei.liu@...cle.com>
Subject: Re: [PATCH v4 1/3] vdpa: Fix error logic in vdpa_nl_cmd_dev_get_doit

On Mon, May 9, 2022 at 12:33 AM Eli Cohen <elic@...dia.com> wrote:
>
> In vdpa_nl_cmd_dev_get_doit(), ff the call to genlmsg_reply() fails we

I guess you mean "if" here?

> must not call nlmsg_free() since this is done inside genlmsg_reply().
>
> Fix it.
>
> Fixes: bc0d90ee021f ("vdpa: Enable user to query vdpa device info")
> Signed-off-by: Eli Cohen <elic@...dia.com>

Other than the above typo.

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

> ---
>  drivers/vdpa/vdpa.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 2b75c00b1005..fac89a0d8178 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -756,14 +756,19 @@ static int vdpa_nl_cmd_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
>                 goto mdev_err;
>         }
>         err = vdpa_dev_fill(vdev, msg, info->snd_portid, info->snd_seq, 0, info->extack);
> -       if (!err)
> -               err = genlmsg_reply(msg, info);
> +       if (err)
> +               goto mdev_err;
> +
> +       err = genlmsg_reply(msg, info);
> +       put_device(dev);
> +       mutex_unlock(&vdpa_dev_mutex);
> +       return err;
> +
>  mdev_err:
>         put_device(dev);
>  err:
>         mutex_unlock(&vdpa_dev_mutex);
> -       if (err)
> -               nlmsg_free(msg);
> +       nlmsg_free(msg);
>         return err;
>  }
>
> --
> 2.35.1
>