linux-kernel - Re: [PATCH bpf] tools: bpftool: Add missing close before bpftool net attach exit

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Date:   Mon, 09 Nov 2020 13:37:50 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Michal Rostecki <mrostecki@...nsuse.org>,
        Wang Hai <wanghai38@...wei.com>, ast@...nel.org,
        daniel@...earbox.net, kafai@...com, songliubraving@...com,
        yhs@...com, andrii@...nel.org, john.fastabend@...il.com,
        kpsingh@...omium.org, toke@...hat.com, quentin@...valent.com,
        danieltimlee@...il.com
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf] tools: bpftool: Add missing close before bpftool net
 attach exit

Michal Rostecki wrote:
> On 11/9/20 8:04 AM, Wang Hai wrote:
> > progfd is created by prog_parse_fd(), before 'bpftool net attach' exit,
> > it should be closed.
> > 
> > Fixes: 04949ccc273e ("tools: bpftool: add net attach command to attach XDP on interface")
> > Signed-off-by: Wang Hai <wanghai38@...wei.com>
> > ---
> >   tools/bpf/bpftool/net.c | 2 ++
> >   1 file changed, 2 insertions(+)
> > 
> > diff --git a/tools/bpf/bpftool/net.c b/tools/bpf/bpftool/net.c
> > index 910e7bac6e9e..3e9b40e64fb0 100644
> > --- a/tools/bpf/bpftool/net.c
> > +++ b/tools/bpf/bpftool/net.c
> > @@ -600,12 +600,14 @@ static int do_attach(int argc, char **argv)
> >   	if (err < 0) {
> >   		p_err("interface %s attach failed: %s",
> >   		      attach_type_strings[attach_type], strerror(-err));
> > +		close(progfd);
> >   		return err;
> >   	}
> >   
> >   	if (json_output)
> >   		jsonw_null(json_wtr);
> >   
> > +	close(progfd);
> >   	return 0;
> >   }
> >   
> 
> Nit - wouldn't it be better to create a `cleanup`/`out` section before 
> return and use goto, to avoid copying the `close` call?

I agree would be nicer.