From: Jens Axboe <axboe@kernel.dk>
To: Colin King <colin.king@canonical.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][next] io-wq: fix unintentional integer overflow on left shift
Date: Fri, 25 Oct 2019 12:54:55 +0000 [thread overview]
Message-ID: <fc23061e-31ec-8a66-2b62-771121d182de@kernel.dk> (raw)
In-Reply-To: <20191025124315.21742-1-colin.king@canonical.com>
On 10/25/19 6:43 AM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.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
WARNING: multiple messages have this Message-ID (diff)
From: Jens Axboe <axboe@kernel.dk>
To: Colin King <colin.king@canonical.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][next] io-wq: fix unintentional integer overflow on left shift
Date: Fri, 25 Oct 2019 06:54:55 -0600 [thread overview]
Message-ID: <fc23061e-31ec-8a66-2b62-771121d182de@kernel.dk> (raw)
In-Reply-To: <20191025124315.21742-1-colin.king@canonical.com>
On 10/25/19 6:43 AM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.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
next prev parent reply other threads:[~2019-10-25 12:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-25 12:43 [PATCH][next] io-wq: fix unintentional integer overflow on left shift Colin King
2019-10-25 12:43 ` Colin King
2019-10-25 12:54 ` Jens Axboe [this message]
2019-10-25 12:54 ` Jens Axboe
2019-10-25 13:56 ` Jens Axboe
2019-10-25 13:56 ` Jens Axboe
2019-10-25 13:59 ` Colin Ian King
2019-10-25 13:59 ` Colin Ian King
2019-10-25 13:59 ` Jens Axboe
2019-10-25 13:59 ` Jens Axboe
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