linux-kernel - Re: [PATCH v1] soc: bcm: Check for NULL return of devm

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Date:   Fri, 25 Mar 2022 12:02:28 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     QintaoShen <unSimple1993@....com>, <f.fainelli@...il.com>
CC:     <bcm-kernel-feedback-list@...adcom.com>,
        <linux-mips@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] soc: bcm: Check for NULL return of devm_kzalloc()

Hello!

   s/return/result/ in the subject.

On 3/24/22 11:35 AM, QintaoShen wrote:

> As the potential failuer of allocation, devm_kzalloc() may return NULL.
> Then the 'pd->pmb' and the follow lines of code may bring null pointer dereference.

   Following.

> Therefore, it is better to check the return value of devm_kzalloc() to avoid this confusion.
> 
> Signed-off-by: QintaoShen <unSimple1993@....com>
> ---
>  drivers/soc/bcm/bcm63xx/bcm-pmb.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/soc/bcm/bcm63xx/bcm-pmb.c b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
> index 7bbe46e..55bf389 100644
> --- a/drivers/soc/bcm/bcm63xx/bcm-pmb.c
> +++ b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
> @@ -311,6 +311,8 @@ static int bcm_pmb_probe(struct platform_device *pdev)
>  
>  	for (e = table; e->name; e++) {
>  		struct bcm_pmb_pm_domain *pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);

   Please keep an empty line after declaration.

> +		if (!pd)
> +			return -ENOMEM;
>  
>  		pd->pmb = pmb;
>  		pd->data = e;

MBR, Sergey