linux-kernel - Re: [PATCH v2] net: ieee802154: fix shift-out-of-bound in nl802154_new

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Message-ID: <CAB_54W6K+FTTRxLbUHp8csBbtJf=E+JU-zd3q7mQZpa-LHTX8A@mail.gmail.com>
Date:   Thu, 11 Nov 2021 22:12:12 -0500
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>,
        Marcel Holtmann <marcel@...tmann.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 v2] net: ieee802154: fix shift-out-of-bound in nl802154_new_interface

Hi,

On Thu, 11 Nov 2021 at 09:59, Dongliang Mu <mudongliangabcd@...il.com> wrote:
>
> In nl802154_new_interface, if type retrieved from info->attr is
> NL802154_IFTYPE_UNSPEC(-1), i.e., less than NL802154_IFTYPE_MAX,
> it will trigger a shift-out-of-bound bug in BIT(type) [1].
>
> Fix this by adding a condition to check if the variable type is
> larger than NL802154_IFTYPE_UNSPEC(-1).
>

Thanks.

I just sent another patch to fix this issue. The real problem here is
that the enum type doesn't fit into the u32 netlink range as I
mentioned some months ago. [0] Sorry for the delayed fix.

- Alex

[0] https://lore.kernel.org/linux-wpan/CAB_54W62WZCcPintGnu-kqzCmgAH7EsJxP9oaeD2NVZ03e_2Wg@mail.gmail.com/T/#t