linux-kernel - Re: [PATCH net] bpf: test_run: fix WARNING in format

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Message-ID: <4f832b6f-97b1-45b1-a210-b497ee6e55d5@linux.dev>
Date:   Tue, 21 Nov 2023 21:28:29 -0800
From:   Yonghong Song <yonghong.song@...ux.dev>
To:     Edward Adam Davis <eadavis@...com>,
        syzbot+e2c932aec5c8a6e1d31c@...kaller.appspotmail.com
Cc:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, edumazet@...gle.com,
        haoluo@...gle.com, hawk@...nel.org, john.fastabend@...il.com,
        jolsa@...nel.org, kpsingh@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        martin.lau@...nel.org, martin.lau@...ux.dev, mhiramat@...nel.org,
        netdev@...r.kernel.org, pabeni@...hat.com, rostedt@...dmis.org,
        sdf@...gle.com, song@...nel.org, syzkaller-bugs@...glegroups.com,
        yhs@...com
Subject: Re: [PATCH net] bpf: test_run: fix WARNING in format_decode


On 11/21/23 7:50 PM, Edward Adam Davis wrote:
> Confirm that skb->len is not 0 to ensure that skb length is valid.
>
> Fixes: 114039b34201 ("bpf: Move skb->len == 0 checks into __bpf_redirect")
> Reported-by: syzbot+e2c932aec5c8a6e1d31c@...kaller.appspotmail.com
> Signed-off-by: Edward Adam Davis <eadavis@...com>

Stan, Could you take a look at this patch?


> ---
>   net/bpf/test_run.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
> index c9fdcc5cdce1..78258a822a5c 100644
> --- a/net/bpf/test_run.c
> +++ b/net/bpf/test_run.c
> @@ -845,6 +845,9 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
>   {
>   	struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
>   
> +	if (!skb->len)
> +		return -EINVAL;
> +
>   	if (!__skb)
>   		return 0;
>