netdev - Re: [PATCH bpf] tools: bpftool: use correct argument in cgroup errors

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Date:   Tue, 25 Jun 2019 17:21:31 +0000
From:   Roman Gushchin <guro@...com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     "alexei.starovoitov@...il.com" <alexei.starovoitov@...il.com>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "oss-drivers@...ronome.com" <oss-drivers@...ronome.com>,
        "sdf@...gle.com" <sdf@...gle.com>,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: Re: [PATCH bpf] tools: bpftool: use correct argument in cgroup errors

On Tue, Jun 25, 2019 at 09:56:31AM -0700, Jakub Kicinski wrote:
> cgroup code tries to use argv[0] as the cgroup path,
> but if it fails uses argv[1] to report errors.
> 
> Fixes: 5ccda64d38cc ("bpftool: implement cgroup bpf operations")
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>

Acked-by: Roman Gushchin <guro@...com>

Thanks, Jakub!

> ---
>  tools/bpf/bpftool/cgroup.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/bpf/bpftool/cgroup.c b/tools/bpf/bpftool/cgroup.c
> index 73ec8ea33fb4..a13fb7265d1a 100644
> --- a/tools/bpf/bpftool/cgroup.c
> +++ b/tools/bpf/bpftool/cgroup.c
> @@ -168,7 +168,7 @@ static int do_show(int argc, char **argv)
>  
>  	cgroup_fd = open(argv[0], O_RDONLY);
>  	if (cgroup_fd < 0) {
> -		p_err("can't open cgroup %s", argv[1]);
> +		p_err("can't open cgroup %s", argv[0]);
>  		goto exit;
>  	}
>  
> @@ -356,7 +356,7 @@ static int do_attach(int argc, char **argv)
>  
>  	cgroup_fd = open(argv[0], O_RDONLY);
>  	if (cgroup_fd < 0) {
> -		p_err("can't open cgroup %s", argv[1]);
> +		p_err("can't open cgroup %s", argv[0]);
>  		goto exit;
>  	}
>  
> @@ -414,7 +414,7 @@ static int do_detach(int argc, char **argv)
>  
>  	cgroup_fd = open(argv[0], O_RDONLY);
>  	if (cgroup_fd < 0) {
> -		p_err("can't open cgroup %s", argv[1]);
> +		p_err("can't open cgroup %s", argv[0]);
>  		goto exit;
>  	}
>  
> -- 
> 2.21.0
>