On Fri, May 05, 2023 at 02:24:04PM +0800, [email protected] wrote:
> From: Ye Xingchen <[email protected]>
> 
> convert the fget()/fput() uses to fdget()/fdput().
> 
> Signed-off-by: Ye Xingchen <[email protected]>
> ---
>  drivers/vhost/net.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index ae2273196b0c..5b3fe4805182 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -1466,17 +1466,17 @@ static struct ptr_ring *get_tap_ptr_ring(struct file 
> *file)
> 
>  static struct socket *get_tap_socket(int fd)
>  {
> -     struct file *file = fget(fd);
> +     struct fd f = fdget(fd);
>       struct socket *sock;
> 
> -     if (!file)
> +     if (!f.file)
>               return ERR_PTR(-EBADF);
> -     sock = tun_get_socket(file);
> +     sock = tun_get_socket(f.file);
>       if (!IS_ERR(sock))
>               return sock;
> -     sock = tap_get_socket(file);
> +     sock = tap_get_socket(f.file);
>       if (IS_ERR(sock))
> -             fput(file);
> +             fdput(f);
>       return sock;

NAK.  For the same reason why the sockfd_lookup() counterpart of that
patch is broken.  After your change there's no way for the caller
to tell whether we have bumped the refcount of file in question;
this can't possibly work.
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