linux-kernel - Re: [PATCH] memory: jz4780_nemc: Fix potential NULL dereference in jz4780_nemc

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Date:   Fri, 04 Dec 2020 10:09:31 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Zhang Changzhong <zhangchangzhong@...wei.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Smith <alex.smith@...tec.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memory: jz4780_nemc: Fix potential NULL dereference in
 jz4780_nemc_probe()

Hi Zhang,

Le ven. 4 déc. 2020 à 16:31, Zhang Changzhong 
<zhangchangzhong@...wei.com> a écrit :
> platform_get_resource() may fail and return NULL, so we should
> better check it's return value to avoid a NULL pointer dereference
> a bit later in the code.
> 
> This is detected by Coccinelle semantic patch.
> 
> @@
> expression pdev, res, n, t, e, e1, e2;
> @@
> 
> res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t,
> n);
> + if (!res)
> +   return -EINVAL;
> ... when != res == NULL
> e = devm_ioremap(e1, res->start, e2);
> 
> Fixes: 911a88829725 ("memory: jz4780-nemc: driver for the NEMC on 
> JZ4780 SoCs")
> Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>

Acked-by: Paul Cercueil <paul@...pouillou.net>

Cheers,
-Paul

> ---
>  drivers/memory/jz4780-nemc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/memory/jz4780-nemc.c 
> b/drivers/memory/jz4780-nemc.c
> index 3ec5cb0..465ea92 100644
> --- a/drivers/memory/jz4780-nemc.c
> +++ b/drivers/memory/jz4780-nemc.c
> @@ -291,6 +291,8 @@ static int jz4780_nemc_probe(struct 
> platform_device *pdev)
>  	nemc->dev = dev;
> 
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -EINVAL;
> 
>  	/*
>  	 * The driver currently only uses the registers up to offset
> --
> 2.9.5
>