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Date:   Tue, 23 Apr 2019 19:10:28 +0200
From:   Marcel Holtmann <>
To:     Dan Carpenter <>
Cc:     Alexander Aring <>,
        Jukka Rissanen <>,
        "David S. Miller" <>,,,,
Subject: Re: [PATCH net] 6lowpan: Off by one handling ->nexthdr

Hi Dan,

> 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 <>
> ---
> This is the only place which uses the NEXTHDR_MAX define, so I considered
> changing that to 256 instead.  Either fix would work.
> net/6lowpan/nhc.c  | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)

patch has been applied to bluetooth-next tree.



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