linux-kernel - Re: [PATCH] clk: mmp: pxa168: Fix memory leak in pxa168_clk

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Message-ID: <20231211-urgent-carol-45ca352a9d2a@wendy>
Date:   Mon, 11 Dec 2023 13:19:17 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Kuan-Wei Chiu <visitorckw@...il.com>
CC:     <mturquette@...libre.com>, <sboyd@...nel.org>,
        <duje.mihanovic@...le.hr>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: mmp: pxa168: Fix memory leak in pxa168_clk_init()

On Mon, Dec 11, 2023 at 01:52:32AM +0800, Kuan-Wei Chiu wrote:
> In cases where mapping of mpmu/apmu/apbc registers fails, the code path
> does not handle the failure gracefully, potentially leading to a memory
> leak. This fix ensures proper cleanup by freeing the allocated memory
> for 'pxa_unit' before returning.
> 
> Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>

I dunno why you have CCed me on this tbh, I guess I must have acked a
patch related to this driver's bindings somehow.

I wonder, is there actually any point in freeing these, isn't the system
going to fail to actually boot if these allocations fail?

> ---
>  drivers/clk/mmp/clk-of-pxa168.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/clk/mmp/clk-of-pxa168.c b/drivers/clk/mmp/clk-of-pxa168.c
> index fb0df64cf053..c5a7ba1deaa3 100644
> --- a/drivers/clk/mmp/clk-of-pxa168.c
> +++ b/drivers/clk/mmp/clk-of-pxa168.c
> @@ -308,18 +308,21 @@ static void __init pxa168_clk_init(struct device_node *np)
>  	pxa_unit->mpmu_base = of_iomap(np, 0);
>  	if (!pxa_unit->mpmu_base) {
>  		pr_err("failed to map mpmu registers\n");
> +		kfree(pxa_unit);
>  		return;
>  	}
>  
>  	pxa_unit->apmu_base = of_iomap(np, 1);
>  	if (!pxa_unit->apmu_base) {
>  		pr_err("failed to map apmu registers\n");
> +		kfree(pxa_unit);
>  		return;
>  	}
>  
>  	pxa_unit->apbc_base = of_iomap(np, 2);
>  	if (!pxa_unit->apbc_base) {
>  		pr_err("failed to map apbc registers\n");
> +		kfree(pxa_unit);
>  		return;
>  	}
>  
> -- 
> 2.25.1
> 

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