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

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Date:   Tue, 7 Mar 2023 18:29:52 -0500
From:   Alexander Aring <aahringo@...hat.com>
To:     Simon Horman <simon.horman@...igine.com>
Cc:     Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
        Dan Carpenter <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 Tue, Mar 7, 2023 at 3:44 AM Simon Horman <simon.horman@...igine.com> wrote:
>
> On Mon, Mar 06, 2023 at 11:18:24AM -0800, Harshit Mogalapalli 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>
>
> I discussed this briefly with Harshit offline.
>
> The commit referenced above tag does add the call to
> ieee802154_hdr_peek_addrs(), an there is a sign miss match between
> the return value and the variable.
>
> The code to check the mac_len was added more recently, by the following
> commit. However the fixes tag is probably fine as-is, because it's fixing
> error handling of a call made in that commit.
>
> 6c993779ea1d ("ca8210: fix mac_len negative array access")
>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>
>

sure, thanks for catching this.

- Alex