netdev - Re: [PATCH] net: mac802154: Fix a condition in the receive path

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Date:   Sun, 28 Aug 2022 20:16:20 -0400
From:   Alexander Aring <aahringo@...hat.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Network Development <netdev@...r.kernel.org>,
        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>,
        stable@...r.kernel.org
Subject: Re: [PATCH] net: mac802154: Fix a condition in the receive path

Hi,

On Fri, Aug 26, 2022 at 10:31 AM Miquel Raynal
<miquel.raynal@...tlin.com> wrote:
>
> Upon reception, a packet must be categorized, either it's destination is
> the host, or it is another host. A packet with no destination addressing
> fields may be valid in two situations:
> - the packet has no source field: only ACKs are built like that, we
>   consider the host as the destination.
> - the packet has a valid source field: it is directed to the PAN
>   coordinator, as for know we don't have this information we consider we
>   are not the PAN coordinator.
>
> There was likely a copy/paste error made during a previous cleanup
> because the if clause is now containing exactly the same condition as in
> the switch case, which can never be true. In the past the destination
> address was used in the switch and the source address was used in the
> if, which matches what the spec says.
>
> Cc: stable@...r.kernel.org
> Fixes: ae531b9475f6 ("ieee802154: use ieee802154_addr instead of *_sa variants")
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  net/mac802154/rx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
> index b8ce84618a55..c439125ef2b9 100644
> --- a/net/mac802154/rx.c
> +++ b/net/mac802154/rx.c
> @@ -44,7 +44,7 @@ ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
>
>         switch (mac_cb(skb)->dest.mode) {
>         case IEEE802154_ADDR_NONE:
> -               if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
> +               if (hdr->source.mode != IEEE802154_ADDR_NONE)
>                         /* FIXME: check if we are PAN coordinator */
>                         skb->pkt_type = PACKET_OTHERHOST;
>                 else


This patch looks okay but it should not be addressed to stable. Leave
of course the fixes tag.

Wpan sends pull requests to net and they have their own way to get
into the stable tree when they are in net.

Thanks.

- Alex