linux-kernel - Re: [PATCH] media: mtk-vcodec: potential dereference of null pointer

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Message-ID: <Ybl3PwH5CLBp8ZHz@google.com>
Date:   Wed, 15 Dec 2021 13:03:59 +0800
From:   Tzung-Bi Shih <tzungbi@...gle.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     tiffany.lin@...iatek.com, andrew-ct.chen@...iatek.com,
        mchehab@...nel.org, matthias.bgg@...il.com,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: mtk-vcodec: potential dereference of null pointer

On Wed, Dec 15, 2021 at 11:28:34AM +0800, Jiasheng Jiang wrote:
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c
> index cd27f637dbe7..769228093e48 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_vpu.c
> @@ -102,6 +102,8 @@ struct mtk_vcodec_fw *mtk_vcodec_fw_vpu_init(struct mtk_vcodec_dev *dev,
>  	vpu_wdt_reg_handler(fw_pdev, mtk_vcodec_vpu_reset_handler, dev, rst_id);
>  
>  	fw = devm_kzalloc(&dev->plat_dev->dev, sizeof(*fw), GFP_KERNEL);
> +	if (!fw)
> +		return ERR_PTR(-EINVAL);

It should return -ENOMEM for the case.