linux-kernel - Re: [PATCH bpf-next 1/4] bpf: sockmap: enable map_update_elem from bpf

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Date:   Fri, 25 Sep 2020 14:53:59 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Lorenz Bauer <lmb@...udflare.com>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <kernel-team@...udflare.com>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next 1/4] bpf: sockmap: enable map_update_elem from
 bpf_iter

On Fri, Sep 25, 2020 at 10:56:27AM +0100, Lorenz Bauer wrote:
[ ... ]

> diff --git a/net/core/sock_map.c b/net/core/sock_map.c
> index e1f05e3fa1d0..497e7df466d4 100644
> --- a/net/core/sock_map.c
> +++ b/net/core/sock_map.c
> @@ -610,6 +610,9 @@ static int sock_map_update_elem(struct bpf_map *map, void *key,
>  	struct sock *sk = (struct sock *)value;
>  	int ret;
>  
> +	if (unlikely(!sk))
sk_fullsock(sk) test is also needed.

> +		return -EINVAL;

> +
>  	if (!sock_map_sk_is_suitable(sk))
sk->sk_type is used in sock_map_sk_is_suitable().
sk_type is not in sock_common.