linux-kernel - Re: [PATCH] media: vpss: fix a potential NULL pointer dereference

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Message-ID: <521823d8-a884-2772-5f18-9fc8809b69e4@codeaurora.org>
Date:   Wed, 27 Mar 2019 19:03:02 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, "Lad, Prabhakar" <prabhakar.csengg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: vpss: fix a potential NULL pointer dereference


On 3/9/2019 12:23 PM, Kangjie Lu wrote:
> In case ioremap fails, the fix returns -ENOMEM to avoid NULL
> pointer dereference.
>
> Signed-off-by: Kangjie Lu <kjlu@....edu>

Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>

-Mukesh


> ---
>   drivers/media/platform/davinci/vpss.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/media/platform/davinci/vpss.c b/drivers/media/platform/davinci/vpss.c
> index 19cf6853411e..f7beed2de9cb 100644
> --- a/drivers/media/platform/davinci/vpss.c
> +++ b/drivers/media/platform/davinci/vpss.c
> @@ -518,6 +518,9 @@ static int __init vpss_init(void)
>   		return -EBUSY;
>   
>   	oper_cfg.vpss_regs_base2 = ioremap(VPSS_CLK_CTRL, 4);
> +	if (unlikely(!oper_cfg.vpss_regs_base2))
> +		return -ENOMEM;
> +
>   	writel(VPSS_CLK_CTRL_VENCCLKEN |
>   		     VPSS_CLK_CTRL_DACCLKEN, oper_cfg.vpss_regs_base2);
>