linux-kernel - Re: [PATCH] 6lowpan: iphc: Fix an off-by-one check of array index

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Date:   Thu, 22 Jul 2021 16:19:46 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Alexander Aring <alex.aring@...il.com>,
        Jukka Rissanen <jukka.rissanen@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Stefan Schmidt <stefan@....samsung.com>,
        Bluetooth Kernel Mailing List 
        <linux-bluetooth@...r.kernel.org>, linux-wpan@...r.kernel.org,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 6lowpan: iphc: Fix an off-by-one check of array index

Hi Colin,

> The bounds check of id is off-by-one and the comparison should
> be >= rather >. Currently the WARN_ON_ONCE check does not stop
> the out of range indexing of &ldev->ctx.table[id] so also add
> a return path if the bounds are out of range.
> 
> Addresses-Coverity: ("Illegal address computation").
> Fixes: 5609c185f24d ("6lowpan: iphc: add support for stateful compression")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
> net/6lowpan/debugfs.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel