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

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Date:   Wed, 20 Jan 2021 22:10:24 +0100
From:   KP Singh <kpsingh@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Pan Bian <bianpan2016@....com>,
        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>,
        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 Wed, Jan 20, 2021 at 8:23 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> 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>

Thanks for fixing this! (You can add my ack with the fixes tag when
you resubmit)

Fixes: 8ea636848aca ("bpf: Implement bpf_local_storage for inodes")
Acked-by: KP Singh <kpsingh@...nel.org>

> > ---
> >  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.