linux-kernel - Re: [PATCH] interconnect: qcom: msm8974: Prevent integer overflow in rate

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Message-ID: <20201107003727.GD2775@onstation.org>
Date:   Fri, 6 Nov 2020 19:37:27 -0500
From:   Brian Masney <masneyb@...tation.org>
To:     Georgi Djakov <georgi.djakov@...aro.org>
Cc:     linux-pm@...r.kernel.org, luca@...tu.xyz,
        bjorn.andersson@...aro.org, saravanak@...gle.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] interconnect: qcom: msm8974: Prevent integer overflow in
 rate

On Fri, Nov 06, 2020 at 04:48:47PM +0200, Georgi Djakov wrote:
> When sync_state support got introduced recently, by default we try to
> set the NoCs to run initially at maximum rate. But as these values are
> aggregated, we may end with a really big clock rate value, which is
> then converted from "u64" to "long" during the clock rate rounding.
> But on 32bit platforms this may result an overflow. Fix it by making
> sure that the rate is within range.
> 
> Reported-by: Luca Weiss <luca@...tu.xyz>
> Fixes: b1d681d8d324 ("interconnect: Add sync state support")
> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>

Reviewed-by: Brian Masney <masneyb@...tation.org>