linux-kernel - Re: [PATCH] clk: pxa: add a check for the return value of kzalloc()

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Message-Id: <20220407033409.DC889C385A1@smtp.kernel.org>
Date:   Wed, 06 Apr 2022 20:34:07 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     mturquette@...libre.com, xkernel.wang@...mail.com
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: Re: [PATCH] clk: pxa: add a check for the return value of kzalloc()

Quoting xkernel.wang@...mail.com (2022-03-25 03:27:20)
> From: Xiaoke Wang <xkernel.wang@...mail.com>
> 
> kzalloc() is a memory allocation function which can return NULL when
> some internal memory errors happen. So it is better to check it to
> prevent potential wrong memory access.
> 
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
> ---
>  drivers/clk/pxa/clk-pxa.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/clk/pxa/clk-pxa.c b/drivers/clk/pxa/clk-pxa.c
> index cfc79f9..d0df104 100644
> --- a/drivers/clk/pxa/clk-pxa.c
> +++ b/drivers/clk/pxa/clk-pxa.c
> @@ -102,6 +102,8 @@ int __init clk_pxa_cken_init(const struct desc_clk_cken *clks, int nb_clks)
>  
>         for (i = 0; i < nb_clks; i++) {
>                 pxa_clk = kzalloc(sizeof(*pxa_clk), GFP_KERNEL);
> +               if (!pxa_clk)
> +                       continue;

Shouldn't we stop trying to allocate more and return an error?