linux-kernel - Re: [PATCH][next] 6lowpan: fix off-by-one comparison of index id with LOWPAN_IPHC_CTX_TABLE

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Date:   Sat, 6 Jul 2019 12:51:00 +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>,
        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][next] 6lowpan: fix off-by-one comparison of index id with
 LOWPAN_IPHC_CTX_TABLE_SIZE

Hi Colin,

> The WARN_ON_ONCE check on id is off-by-one, it should be greater or equal
> to LOWPAN_IPHC_CTX_TABLE_SIZE and not greater than. Fix this.
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
> net/6lowpan/debugfs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/6lowpan/debugfs.c b/net/6lowpan/debugfs.c
> index 1c140af06d52..a510bed8165b 100644
> --- a/net/6lowpan/debugfs.c
> +++ b/net/6lowpan/debugfs.c
> @@ -170,7 +170,7 @@ static void lowpan_dev_debugfs_ctx_init(struct net_device *dev,
> 	struct dentry *root;
> 	char buf[32];
> 
> -	WARN_ON_ONCE(id > LOWPAN_IPHC_CTX_TABLE_SIZE);
> +	WARN_ON_ONCE(id >= LOWPAN_IPHC_CTX_TABLE_SIZE);

this patch no longer applied cleanly to bluetooth-next. Can you send me an updated version.

Regards

Marcel