linux-kernel - RE: [PATCH 07/18] clk: imx: pll14xx: potential integer overflow eliminated by casting to u64

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Date: Sat, 4 May 2024 13:13:17 +0000
From: Peng Fan <peng.fan@....com>
To: Francesco Dolcini <francesco@...cini.it>, "Peng Fan (OSS)"
	<peng.fan@....nxp.com>
CC: Abel Vesa <abelvesa@...nel.org>, Michael Turquette
	<mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, Shawn Guo
	<shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix
 Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>,
	Jacky Bai <ping.bai@....com>, Ye Li <ye.li@....com>, Aisheng Dong
	<aisheng.dong@....com>, "linux-clk@...r.kernel.org"
	<linux-clk@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Abel Vesa <abel.vesa@...aro.org>, Florin
 Pavelescu <florin.pavelescu@....com>, Viorel Suman <viorel.suman@....com>
Subject: RE: [PATCH 07/18] clk: imx: pll14xx: potential integer overflow
 eliminated by casting to u64

> Subject: Re: [PATCH 07/18] clk: imx: pll14xx: potential integer overflow
> eliminated by casting to u64
> 
> Hello Peng,
> 
> On Sat, May 04, 2024 at 08:49:00AM +0800, Peng Fan (OSS) wrote:
> > From: Florin Pavelescu <florin.pavelescu@....com>
> >
> > Cast to u64, so that multiplications and additions will be done in
> > 64-bit arithmetic (and the results will also be 64-bit) and the
> > possibility of integer overflow is eliminated.
> >
> > Fix Unintentional integer overflow reported by Coverity
> 
> Fixes tag if this is a fix?
> 
> It would be interesting in general if this can be trigger in real life and with
> which side effects or if we are just silencing the tool

This is just to silencing the tool, maybe this patch is no needed.

Thanks,
Peng.