linux-kernel - Re: [PATCH][V2] cxgb4: fix signed wrap around when decrementing index idx

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Message-Id: <20160923.072537.1771650721180471237.davem@davemloft.net>
Date:   Fri, 23 Sep 2016 07:25:37 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     hariprasad@...lsio.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] cxgb4: fix signed wrap around when decrementing
 index idx

From: Colin King <colin.king@...onical.com>
Date: Thu, 22 Sep 2016 18:48:58 +0100

> From: Colin Ian King <colin.king@...onical.com>
> 
> Change predecrement compare to post decrement compare to avoid an
> unsigned integer wrap-around comparison when decrementing idx in
> the while loop.
> 
> For example, when idx is zero, the current situation will
> predecrement idx in the while loop, wrapping idx to the maximum
> signed integer and cause out of bounds reads on rxq_info->msix_tbl[idx].
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied to net-next, thanks.