linux-kernel - Re: [PATCH][V2] net: lio_core: fix potential sign-extension overflow on large shift

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Message-Id: <20190618.210125.383827657449306914.davem@davemloft.net>
Date:   Tue, 18 Jun 2019 21:01:25 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     dchickles@...vell.com, sburla@...vell.com, fmanlunas@...vell.com,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] net: lio_core: fix potential sign-extension
 overflow on large shift

From: Colin King <colin.king@...onical.com>
Date: Mon, 17 Jun 2019 17:12:49 +0100

> From: Colin Ian King <colin.king@...onical.com>
> 
> Left shifting the signed int value 1 by 31 bits has undefined behaviour
> and the shift amount oq_no can be as much as 63.  Fix this by using
> BIT_ULL(oq_no) instead.
> 
> Addresses-Coverity: ("Bad shift operation")
> Fixes: f21fb3ed364b ("Add support of Cavium Liquidio ethernet adapters")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
> 
> V2: Use BIT_ULL(oq_no) instead of 1ULL << oq_no. Thanks to Dan Carpenter for
>     noting this is more appropriate.

Applied.