netdev - Re: [PATCH] bpf: add missing percpu_counter_destroy() in htab_map

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Date:   Sat, 10 Sep 2022 16:11:08 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        syzbot <syzbot+5d1da78b375c3b5e6c2b@...kaller.appspotmail.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH] bpf: add missing percpu_counter_destroy() in htab_map_alloc()

On Sat, Sep 10, 2022 at 8:08 AM Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> wrote:
>
> syzbot is reporting ODEBUG bug in htab_map_alloc() [1], for
> commit 86fe28f7692d96d2 ("bpf: Optimize element count in non-preallocated
> hash map.") added percpu_counter_init() to htab_map_alloc() but forgot to
> add percpu_counter_destroy() to the error path.
>
> Link: https://syzkaller.appspot.com/bug?extid=5d1da78b375c3b5e6c2b [1]
> Reported-by: syzbot <syzbot+5d1da78b375c3b5e6c2b@...kaller.appspotmail.com>
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Fixes: 86fe28f7692d96d2 ("bpf: Optimize element count in non-preallocated hash map.")
> ---
>  kernel/bpf/hashtab.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
> index 0fe3f136cbbe..86aec20c22d0 100644
> --- a/kernel/bpf/hashtab.c
> +++ b/kernel/bpf/hashtab.c
> @@ -622,6 +622,8 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
>  free_prealloc:
>         prealloc_destroy(htab);
>  free_map_locked:
> +       if (htab->use_percpu_counter)
> +               percpu_counter_destroy(&htab->pcount);

Thank you for the fix! Applied