linux-kernel - Re: [PATCH v3 3/4] drm/mediatek: Add casting before assign

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Date:   Fri, 14 Jul 2023 06:45:38 +0000
From:   Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>
To:     CK Hu (胡俊光) <ck.hu@...iatek.com>,
        "amergnat@...libre.com" <amergnat@...libre.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Singo Chang (張興國) 
        <Singo.Chang@...iatek.com>,
        Johnson Wang (王聖鑫) 
        <Johnson.Wang@...iatek.com>,
        Jason-ch Chen (陳建豪) 
        <Jason-ch.Chen@...iatek.com>,
        Shawn Sung (宋孝謙) 
        <Shawn.Sung@...iatek.com>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH v3 3/4] drm/mediatek: Add casting before assign

Hi CK,

Thanks for the reviews.

On Fri, 2023-07-14 at 05:45 +0000, CK Hu (胡俊光) wrote:
> Hi, Jason:
> 
> On Wed, 2023-06-21 at 18:22 +0800, Jason-JH.Lin wrote:
> > 1. Add casting before assign to avoid the unintentional integer
> >    overflow or unintended sign extension.
> > 2. Add a int varriable for multiplier calculation instead of
> > calculating
> >    different types multiplier with dma_addr_t varriable directly.
> 
> I agree with these modification, but the title does not match the
> modification.
> 
> Regards,
> CK

I'll change the title and commit msg at the next version below:

Fix unintentional integer overflow in multiplying different types

1. Instead of multiplying 2 variable of different types. Change to
assign a value of one variable and then multiply the other variable.

2. Add a int variable for multiplier calculation instead of calculating
different types multiplier with dma_addr_t variable directly.


Thanks!

Regards,
Jason-JH.Lin
>