linux-kernel - Re: [PATCH] phy: mediatek: Fix missing check in mtk_mipi_tx

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Date:   Thu, 30 Dec 2021 09:56:07 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Miaoqian Lin <linmq006@...il.com>
CC:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Kishon Vijay Abraham I <kishon@...com>,
        "Vinod Koul" <vkoul@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: mediatek: Fix missing check in mtk_mipi_tx_probe

On Fri, 2021-12-24 at 08:21 +0000, Miaoqian Lin wrote:
> The of_device_get_match_data() function may return NULL.
> Add check to prevent potential null dereference.
> 
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  drivers/phy/mediatek/phy-mtk-mipi-dsi.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c
> b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c
> index 28ad9403c441..67b005d5b9e3 100644
> --- a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c
> +++ b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c
> @@ -146,6 +146,8 @@ static int mtk_mipi_tx_probe(struct
> platform_device *pdev)
>  		return -ENOMEM;
>  
>  	mipi_tx->driver_data = of_device_get_match_data(dev);
> +	if (!mipi_tx->driver_data)
> +		return -ENODEV;
>  
>  	mipi_tx->regs = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(mipi_tx->regs))

Acked-by: Chunfeng Yun <chunfeng.yun@...iatek.com>

Thanks