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

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Message-ID: <20190617191708.GI28859@kadam>
Date:   Mon, 17 Jun 2019 22:17:08 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Derek Chickles <dchickles@...vell.com>,
        Satanand Burla <sburla@...vell.com>,
        Felix Manlunas <fmanlunas@...vell.com>,
        "David S . Miller" <davem@...emloft.net>, 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

On Mon, Jun 17, 2019 at 05:12:49PM +0100, Colin King wrote:
> 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>
> ---

Looks good.  Thanks!

Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>

regards,
dan carpenter