netdev - Re: [PATCH 1/2] samples: bpf: ensure that we don't load over MAX

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Message-ID: <a3397e41-7e57-d4c2-96e0-427d9386444a@canonical.com>
Date:   Fri, 13 Jul 2018 16:13:30 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2] samples: bpf: ensure that we don't load over
 MAX_PROGS programs

On 13/07/18 16:11, Dan Carpenter wrote:
> I can't see that we check prog_cnt to ensure it doesn't go over
> MAX_PROGS.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
> index 89161c9ed466..904e775d1a44 100644
> --- a/samples/bpf/bpf_load.c
> +++ b/samples/bpf/bpf_load.c
> @@ -107,6 +107,9 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
>  		return -1;
>  	}
>  
> +	if (prog_cnt == MAX_PROGS)
> +		return -1;
> +

Should that be "if (prog_cnt >= MAX_PROGS)" ?

>  	fd = bpf_load_program(prog_type, prog, insns_cnt, license, kern_version,
>  			      bpf_log_buf, BPF_LOG_BUF_SIZE);
>  	if (fd < 0) {
> --
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