netdev - Re: [wpan-next v2 4/9] net: ieee802154: at86rf230: Stop leaking skb's

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Date:   Sun, 23 Jan 2022 15:43:21 -0500
From:   Alexander Aring <alex.aring@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        Xue Liu <liuxuenetmail@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Harry Morris <harrymorris12@...il.com>,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Nicolas Schodet <nico@...fr.eu.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [wpan-next v2 4/9] net: ieee802154: at86rf230: Stop leaking skb's

Hi,

On Thu, 20 Jan 2022 at 06:21, Miquel Raynal <miquel.raynal@...tlin.com> wrote:
>
> Upon error the ieee802154_xmit_complete() helper is not called. Only
> ieee802154_wake_queue() is called manually. We then leak the skb
> structure.
>
> Free the skb structure upon error before returning.
>
> There is no Fixes tag applying here, many changes have been made on this
> area and the issue kind of always existed.
>
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  drivers/net/ieee802154/at86rf230.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
> index 7d67f41387f5..0746150f78cf 100644
> --- a/drivers/net/ieee802154/at86rf230.c
> +++ b/drivers/net/ieee802154/at86rf230.c
> @@ -344,6 +344,7 @@ at86rf230_async_error_recover_complete(void *context)
>                 kfree(ctx);
>
>         ieee802154_wake_queue(lp->hw);
> +       dev_kfree_skb_any(lp->tx_skb);

as I said in other mails there is more broken, we need a:

if (lp->is_tx) {
        ieee802154_wake_queue(lp->hw);
        dev_kfree_skb_any(lp->tx_skb);
        lp->is_tx = 0;
}

in at86rf230_async_error_recover().

Thanks.

- Alex