linux-kernel - Re: [PATCH] ieee802154: hwsim: Fix possible memory leak in hwsim_subscribe_all

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Date:   Sat, 12 Jun 2021 08:38:44 -0400
From:   Alexander Aring <alex.aring@...il.com>
To:     Dongliang Mu <mudongliangabcd@...il.com>
Cc:     Stefan Schmidt <stefan@...enfreihafen.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ieee802154: hwsim: Fix possible memory leak in hwsim_subscribe_all_others

Hi,

On Thu, 10 Jun 2021 at 21:58, Dongliang Mu <mudongliangabcd@...il.com> wrote:
>
> In hwsim_subscribe_all_others, the error handling code performs
> incorrectly if the second hwsim_alloc_edge fails. When this issue occurs,
> it goes to sub_fail, without cleaning the edges allocated before.
>
> Fixes: f25da51fdc38 ("ieee802154: hwsim: add replacement for fakelb")
> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
> ---
>  drivers/net/ieee802154/mac802154_hwsim.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
> index da9135231c07..366eaae3550a 100644
> --- a/drivers/net/ieee802154/mac802154_hwsim.c
> +++ b/drivers/net/ieee802154/mac802154_hwsim.c
> @@ -715,6 +715,8 @@ static int hwsim_subscribe_all_others(struct hwsim_phy *phy)
>
>         return 0;
>
> +sub_fail:
> +       hwsim_edge_unsubscribe_me(phy);
>  me_fail:
>         rcu_read_lock();
>         list_for_each_entry_rcu(e, &phy->edges, list) {
> @@ -722,8 +724,6 @@ static int hwsim_subscribe_all_others(struct hwsim_phy *phy)
>                 hwsim_free_edge(e);
>         }
>         rcu_read_unlock();
> -sub_fail:

this goto needs to be removed and all goto cases need to end in
me_fail (better named to be fail only).
In an error case both loops need to be iterated again to cleanup.

- Alex