linux-kernel - Re: [PATCH v4 3/4] drm/mediatek: Fix unintentional integer overflow in multiplying different types

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Date:   Thu, 31 Aug 2023 17:06:00 +0900
From:   Fei Shao <fshao@...omium.org>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Alexandre Mergnat <amergnat@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jason-ch Chen <jason-ch.chen@...iatek.com>,
        Johnson Wang <johnson.wang@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        Shawn Sung <shawn.sung@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v4 3/4] drm/mediatek: Fix unintentional integer overflow
 in multiplying different types

On Fri, Jul 14, 2023 at 6:59 PM Jason-JH.Lin <jason-jh.lin@...iatek.com> wrote:
>
> 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.
>
> Fixes: 1a64a7aff8da ("drm/mediatek: Fix cursor plane no update")
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> Reviewed-by: Alexandre Mergnat <amergnat@...libre.com>

Hi CK,

It seems like the series was accepted but this patch in particular
didn't make it into the tree. Could you take a look?

Regards,
Fei