netdev - Re: [PATCH 1/2 v2 net-next] thunderbolt: Fix a couple right shifting to zero bugs

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Message-Id: <20171019.130450.2201375945281744526.davem@davemloft.net>
Date:   Thu, 19 Oct 2017 13:04:50 +0100 (WEST)
From:   David Miller <davem@...emloft.net>
To:     dan.carpenter@...cle.com
Cc:     andreas.noever@...il.com, michael.jamet@...el.com,
        mika.westerberg@...ux.intel.com, yehezkel.bernat@...el.com,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2 v2 net-next] thunderbolt: Fix a couple right
 shifting to zero bugs

From: Dan Carpenter <dan.carpenter@...cle.com>
Date: Tue, 17 Oct 2017 15:32:17 +0300

> The problematic code looks like this:
> 
> 	res_seq = res_hdr->xd_hdr.length_sn & TB_XDOMAIN_SN_MASK;
> 	res_seq >>= TB_XDOMAIN_SN_SHIFT;
> 
> TB_XDOMAIN_SN_SHIFT is 27, and right shifting a u8 27 bits is always
> going to result in zero.  The fix is to declare these variables as u32.
> 
> Fixes: d1ff70241a27 ("thunderbolt: Add support for XDomain discovery protocol")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Applied.