netdev - Re: [PATCH net] 6lowpan: Off by one handling ->nexthdr

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Date:   Mon, 8 Apr 2019 14:16:18 -0400
From:   Alexander Aring <aring@...atatu.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Alexander Aring <alex.aring@...il.com>,
        Jukka Rissanen <jukka.rissanen@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-bluetooth@...r.kernel.org, linux-wpan@...r.kernel.org,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] 6lowpan: Off by one handling ->nexthdr

Hi,

On Wed, Apr 03, 2019 at 08:34:16AM +0300, Dan Carpenter wrote:
> NEXTHDR_MAX is 255.  What happens here is that we take a u8 value
> "hdr->nexthdr" from the network and then look it up in
> lowpan_nexthdr_nhcs[].  The problem is that if hdr->nexthdr is 0xff then
> we read one element beyond the end of the array so the array needs to
> be one element larger.
> 
> Fixes: 92aa7c65d295 ("6lowpan: add generic nhc layer interface")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Acked-by: Alexander Aring <aring@...atatu.com>

Thanks.

- Alex