netdev - Re: [PATCH] genetlink: prevent memory leak in netlbl_unlabel

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Message-ID: <CAHC9VhR+4pZObDz7kG+rxnox2ph4z_wpZdyOL=WmdnRvdQNH9A@mail.gmail.com>
Date:   Wed, 25 Sep 2019 19:27:16 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
Cc:     emamd001@....edu, kjlu@....edu, smccaman@....edu,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] genetlink: prevent memory leak in netlbl_unlabel_defconf

On Wed, Sep 25, 2019 at 6:10 PM Navid Emamdoost
<navid.emamdoost@...il.com> wrote:
>
> In netlbl_unlabel_defconf if netlbl_domhsh_add_default fails the
> allocated entry should be released.
>
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>  net/netlabel/netlabel_unlabeled.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

It is worth noting that netlbl_unlabel_defconf() is only called during
kernel boot by netlbl_init() and if netlbl_unlabel_defconf() returns
an error code the system panics, so this isn't currently a very
practical concern.

That said, netlbl_unlabel_defconf() *should* clean up here just on
principal if nothing else.

Acked-by: Paul Moore <paul@...l-moore.com>

> diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
> index d2e4ab8d1cb1..c63ec480ee4e 100644
> --- a/net/netlabel/netlabel_unlabeled.c
> +++ b/net/netlabel/netlabel_unlabeled.c
> @@ -1541,8 +1541,10 @@ int __init netlbl_unlabel_defconf(void)
>         entry->family = AF_UNSPEC;
>         entry->def.type = NETLBL_NLTYPE_UNLABELED;
>         ret_val = netlbl_domhsh_add_default(entry, &audit_info);
> -       if (ret_val != 0)
> +       if (ret_val != 0) {
> +               kfree(entry);
>                 return ret_val;
> +       }
>
>         netlbl_unlabel_acceptflg_set(1, &audit_info);
>
> --
> 2.17.1
>


-- 
paul moore
www.paul-moore.com