linux-kernel - Re: [PATCH] powerpc/powernv: add NULL check after kzalloc in opal_add_one

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Message-ID: <99de2220-5a64-e81e-6886-447296431548@c-s.fr>
Date:   Sun, 5 Apr 2020 12:13:03 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Qiujun Huang <hqjagain@...il.com>, benh@...nel.crashing.org,
        paulus@...ba.org, mpe@...erman.id.a, tglx@...utronix.de
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/powernv: add NULL check after kzalloc in
 opal_add_one_export



Le 05/04/2020 à 09:51, Qiujun Huang a écrit :
> Here needs a NULL check.
> 
> Issue found by coccinelle.
> 
> Signed-off-by: Qiujun Huang <hqjagain@...il.com>
> ---
>   arch/powerpc/platforms/powernv/opal.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
> index 2b3dfd0b6cdd..09443ae3a86e 100644
> --- a/arch/powerpc/platforms/powernv/opal.c
> +++ b/arch/powerpc/platforms/powernv/opal.c
> @@ -811,6 +811,11 @@ static int opal_add_one_export(struct kobject *parent, const char *export_name,
>   		goto out;
>   
>   	attr = kzalloc(sizeof(*attr), GFP_KERNEL);
> +	if (!attr) {
> +		rc = -ENOMEM;
> +		goto out;

You don't need to go to out:, there is nothing to do. You should do:

	if (!attr)
		return -ENOMEM;

> +	}
> +
>   	name = kstrdup(export_name, GFP_KERNEL);
>   	if (!name) {
>   		rc = -ENOMEM;
> 

Christophe