linux-kernel - Re: [PATCH net-next] ieee802154: ca8210: fix possible u8 overflow in ca8210_rx

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Message-Id: <20181210.220107.751606140724107779.davem@davemloft.net>
Date:   Mon, 10 Dec 2018 22:01:07 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     yuehaibing@...wei.com
Cc:     h.morris@...coda.com, alex.aring@...il.com,
        stefan@...enfreihafen.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-wpan@...r.kernel.org
Subject: Re: [PATCH net-next] ieee802154: ca8210: fix possible u8 overflow
 in ca8210_rx_done

From: YueHaibing <yuehaibing@...wei.com>
Date: Tue, 11 Dec 2018 11:13:39 +0800

> gcc warning this:
> 
> drivers/net/ieee802154/ca8210.c:730:10: warning:
>  comparison is always false due to limited range of data type [-Wtype-limits]
> 
> 'len' is u8 type, we get it from buf[1] adding 2, which can overflow.
> This patch change the type of 'len' to unsigned int to avoid this,also fix
> the gcc warning.
> 
> Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

WPAN maintainers, I am assuming that as maintainers you will be
picking this up and sending it to me.