Re: [PATCH 1/3] nfsd: fix refcount leak when failing to hash nfsd_file

[Youzhong Yang]

Shouldn't we have fh_put(fhp) before 'retry'?

On Wed, Jul 10, 2024 at 9:06 AM Jeff Layton <jlayton@xxxxxxxxxx> wrote:
>
> At this point, we have a new nf that we couldn't properly insert into
> the hashtable. Just free it before retrying, since it was never hashed.
>
> Fixes: c6593366c0bf ("nfsd: don't kill nfsd_files because of lease break error")
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> ---
>  fs/nfsd/filecache.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
> index f84913691b78..4fb5e8546831 100644
> --- a/fs/nfsd/filecache.c
> +++ b/fs/nfsd/filecache.c
> @@ -1038,8 +1038,10 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
>         if (likely(ret == 0))
>                 goto open_file;
>
> -       if (ret == -EEXIST)
> +       if (ret == -EEXIST) {
> +               nfsd_file_free(nf);
>                 goto retry;
> +       }
>         trace_nfsd_file_insert_err(rqstp, inode, may_flags, ret);
>         status = nfserr_jukebox;
>         goto construction_err;
>
> --
> 2.45.2
>