linux-kernel - Re: [PATCH] blk-iocost: fix shift-out-of-bounds in iocg_hick

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Message-ID: <Y4TrLfOj5sTpXyYR@slm.duckdns.org>
Date:   Mon, 28 Nov 2022 07:09:01 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Li Jinlin <lijinlin3@...wei.com>
Cc:     josef@...icpanda.com, axboe@...nel.dk, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        liuzhiqiang26@...wei.com
Subject: Re: [PATCH] blk-iocost: fix shift-out-of-bounds in iocg_hick_delay()

On Sat, Nov 26, 2022 at 08:14:58PM +0800, Li Jinlin wrote:
>  	if (iocg->delay)
> -		delay = iocg->delay >> div64_u64(tdelta, USEC_PER_SEC);
> +		delay = iocg->delay >> min(div64_u64(tdelta, USEC_PER_SEC), 63);

Let's just set delay to 0 if the shift is too big.

Thanks.

-- 
tejun