linux-kernel - Re: [PATCH][next] io-wq: fix unintentional integer overflow on left shift

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Message-ID: <fc23061e-31ec-8a66-2b62-771121d182de@kernel.dk>
Date:   Fri, 25 Oct 2019 06:54:55 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Colin King <colin.king@...onical.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] io-wq: fix unintentional integer overflow on left
 shift

On 10/25/19 6:43 AM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Shifting the integer value 1U is evaluated with type unsigned int
> using 32-bit arithmetic and then used in an expression that expects
> a 64-bit value, so there is potentially an integer overflow. Fix this
> by using the BIT_ULL macro to perform the shift and avoid the overflow.

Good catch, that should indeed have been 1ULL. I'll fold in your
fix, thanks!

-- 
Jens Axboe