linux-kernel - Re: [PATCH next] ca8210: Fix unsigned mac_len comparison with zero in ca8210_skb

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Message-ID: <CAK-6q+iHJouJc2WSuPipC8kieULYg02ipyHaOKDsnj4rT-gcyA@mail.gmail.com>
Date:   Mon, 6 Mar 2023 19:06:31 -0500
From:   Alexander Aring <aahringo@...hat.com>
To:     Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Cc:     error27@...il.com, Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Harry Morris <harrymorris12@...il.com>,
        linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH next] ca8210: Fix unsigned mac_len comparison with zero in ca8210_skb_tx()

Hi,

On Mon, Mar 6, 2023 at 2:20 PM Harshit Mogalapalli
<harshit.m.mogalapalli@...cle.com> wrote:
>
> mac_len is of type unsigned, which can never be less than zero.
>
>         mac_len = ieee802154_hdr_peek_addrs(skb, &header);
>         if (mac_len < 0)
>                 return mac_len;
>
> Change this to type int as ieee802154_hdr_peek_addrs() can return negative
> integers, this is found by static analysis with smatch.
>
> Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>

Acked-by: Alexander Aring <aahringo@...hat.com>

sorry, I didn't see that... Thanks for sending this patch.

- Alex