netdev - Re: [PATCH bpf-next 1/3] libbpf: Fix func leak in attach

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Date:   Thu, 22 Jul 2021 09:15:05 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>
Cc:     Andrii Nakryiko <andrii@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alan Maguire <alan.maguire@...cle.com>
Subject: Re: [PATCH bpf-next 1/3] libbpf: Fix func leak in attach_kprobe

On Wed, Jul 21, 2021 at 11:58:08PM +0200, Jiri Olsa wrote:
> Adding missing free for func pointer in attach_kprobe function.
> 

and of course..

Fixes: a2488b5f483f ("libbpf: Allow specification of "kprobe/function+offset"")

jirka

> Reported-by: Andrii Nakryiko <andrii@...nel.org>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/lib/bpf/libbpf.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 4c153c379989..d46c2dd37be2 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -10431,6 +10431,7 @@ static struct bpf_link *attach_kprobe(const struct bpf_sec_def *sec,
>  		return libbpf_err_ptr(err);
>  	}
>  	if (opts.retprobe && offset != 0) {
> +		free(func);
>  		err = -EINVAL;
>  		pr_warn("kretprobes do not support offset specification\n");
>  		return libbpf_err_ptr(err);
> -- 
> 2.31.1
>