linux-kernel - Re: [PATCH] bpf: put file handler if no storage found

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Date:   Wed, 20 Jan 2021 11:23:27 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Pan Bian <bianpan2016@....com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpf: put file handler if no storage found

On Tue, Jan 19, 2021 at 4:03 AM Pan Bian <bianpan2016@....com> wrote:
>
> Put file f if inode_storage_ptr() returns NULL.
>
> Signed-off-by: Pan Bian <bianpan2016@....com>
> ---
>  kernel/bpf/bpf_inode_storage.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/bpf/bpf_inode_storage.c b/kernel/bpf/bpf_inode_storage.c
> index 6edff97ad594..089d5071d4fc 100644
> --- a/kernel/bpf/bpf_inode_storage.c
> +++ b/kernel/bpf/bpf_inode_storage.c
> @@ -125,8 +125,12 @@ static int bpf_fd_inode_storage_update_elem(struct bpf_map *map, void *key,
>
>         fd = *(int *)key;
>         f = fget_raw(fd);
> -       if (!f || !inode_storage_ptr(f->f_inode))
> +       if (!f)
> +               return -EBADF;
> +       if (!inode_storage_ptr(f->f_inode)) {
> +               fput(f);
>                 return -EBADF;
> +       }

Good catch.
Somehow the patch is not in patchwork.
Could you please resubmit with Fixes tag and reduce cc list?
I guess it's hitting some spam filters in vger.